300.苹果和虫子

#include <bits/stdc++.h>
using namespace std;
int main() {
int n,x,y,ans;
cin >> n >> x >> y;
if(y%x!=0) {
ans= n-(y/x+1);
} else {
ans= n-y/x;
}
if(ans>0) {
cout << ans;
} else {
cout << 0;
}
return 0;
}