#include<iostream> using namespace std; int main(){ int n,x,y; cin>>n>>x>>y; //bool t = a+b>c? true:false; if(n== 0 || y/x>n){ cout<<"0"; }else{ if(y%x == 0){ cout<<n-y/x; }else{ cout<<n-y/x-1; } } return 0; }