[백준] 10156번 : 과자 - C++

https://www.acmicpc.net/problem/10156

#include <iostream>

using namespace std;

int main() {
    int k,n,m;
    cin>>k>>n>>m;
    int sum=k*n-m;
    if(sum>0) cout<<sum;
    else cout<<0;
}