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