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The classic programming language of Bitland is Bit++. This language is so peculiar and complicated.The language is that peculiar as it has exactly one variable, called x. Also, there are two operations:Operation ++ increases the value of variable x by 1.Operation -- decreases the value of variable x by 1.A statement in language Bit++ is a sequence, consisting of exactly one operation and one variable x. The statement is written without spaces, that is, it can only contain characters "+", "-", "X". Executing a statement means applying the operation it contains.A programme in Bit++ is a sequence of statements, each of them needs to be executed. Executing a programme means executing all the statements it contains.You're given a programme in language Bit++. The initial value of x is 0. Execute the programme and find its final value (the value of the variable when this programme is executed).InputThe first line contains a single integer n (1 ≤ n ≤ 150) — the number of statements in the programme.Next n lines contain a statement each. Each statement contains exactly one operation (++ or --) and exactly one variable x (denoted as letter «X»). Thus, there are no empty statements. The operation and the variable can be written in any order.OutputPrint a single integer — the final value of x.

Question

The classic programming language of Bitland is Bit++. This language is so peculiar and complicated.The language is that peculiar as it has exactly one variable, called x. Also, there are two operations:Operation ++ increases the value of variable x by 1.Operation -- decreases the value of variable x by 1.A statement in language Bit++ is a sequence, consisting of exactly one operation and one variable x. The statement is written without spaces, that is, it can only contain characters "+", "-", "X". Executing a statement means applying the operation it contains.A programme in Bit++ is a sequence of statements, each of them needs to be executed. Executing a programme means executing all the statements it contains.You're given a programme in language Bit++. The initial value of x is 0. Execute the programme and find its final value (the value of the variable when this programme is executed).InputThe first line contains a single integer n (1 ≤ n ≤ 150) — the number of statements in the programme.Next n lines contain a statement each. Each statement contains exactly one operation (++ or --) and exactly one variable x (denoted as letter «X»). Thus, there are no empty statements. The operation and the variable can be written in any order.OutputPrint a single integer — the final value of x.

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Solution

To solve this problem, you need to follow these steps:

  1. Initialize a variable x to 0. This will hold the current value of the variable x in the Bit++ program.

  2. Read the number of statements n from the input. This is the number of operations that will be performed on x.

  3. Loop over the range n. For each iteration, do the following:

    a. Read the next statement from the input.

    b. If the statement contains the operation '++', increase the value of x by 1.

    c. If the statement contains the operation '--', decrease the value of x by 1.

  4. After all statements have been processed, print the final value of x.

Here is a Python code snippet that implements these steps:

x = 0
n = int(input())
for _ in range(n):
    statement = input()
    if '++' in statement:
        x += 1
    elif '--' in statement:
        x -= 1
print(x)

This code reads the number of statements, then processes each statement in turn. If the statement contains '++', it increments x; if the statement contains '--', it decrements x. Finally, it prints the final value of x.

This problem has been solved

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