The 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.ExamplesinputCopy1++XoutputCopy1inputCopy2X++--XoutputCopy0

The problem statement is asking for a program that will read a series of operations on a variable "X" and output the final value of "X". The operations are either increment (++X or X++) or decrement (--X or X--).

Here is a step-by-step solution in Python:

1. Initialize a variable "X" to 0. This will keep track of the current value of "X".

X = 0

2. Read the number of statements "n".

n = int(input())

3. Loop over the range of "n" and for each iteration, read the operation on "X".

for _ in range(n):
    operation = input()

4. Check if the operation is increment or decrement. If it's increment, increase the value of "X" by 1. If it's decrement, decrease the value of "X" by 1.

    if '++' in operation:
        X += 1
    else:
        X -= 1

5. After all operations have been processed, print the final value of "X".

print(X)

So, the complete program would look like this:

X = 0
n = int(input())
for _ in range(n):
    operation = input()
    if '++' in operation:
        X += 1
    else:
        X -= 1
print(X)

This program will correctly calculate the final value of "X" after a series of increment and decrement operations.