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