Diwali Discount

//salman_oct_2024
#include <bits/stdc++.h>
using namespace std;
int main() { 
    
    int a, b; 
    cin >> a >> b; 
    
    if (a > b){
        cout << a-b;
    }
    else {
        cout << 0;
    }

    return 0; }