题解

#include <iostream>
using namespace std;
int main(){
int n,x,y,a;
cin >> n >> x >> y;
//(y%x == 0)?a = y/x:a = y/x+1;
if (x >= 0 && x <= 99999 && n >= 0 && n <= 99999 && y >= 0 && y <= 99999) {
a = y/x;
if (y%x != 0) a++;

    if (n-a > 0){
        cout << n - a;
    }else{
        cout << 0;
    }
}
return 0;

}