A300.苹果和虫子题解：

A300.苹果和虫子

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