A300.苹果和虫子题解

#include<iostream>
using namespace std;
int main(){
    int n,x,y;
    cin>>n>>x>>y;
    if(n-y/x<1){
        cout<<0;
    }
    else if(y%x==0){
        cout<<n-y/x;
    }
    else{
        cout<<n-y/x-1;
    }
}