题解

按题意模拟即可

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