题解

#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-(y/x+1);

    if(a<0)
        cout<<"0"<<endl;
    else
        cout<<a<<endl;
	return 0;
}