大佬过来呗

#include <iostream>                                                                    
using namespace std;

int main() {
    int n, x, y, e, r;
    cin >> n >> x >> y;
    e = y / x;
    r = n - e;
    cout << r;
    return 0;
}

哪位大佬能告诉我怎么错了？