小题解

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