#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); return 0; } if(y/x>0){ cout<< (n-y/x-1); return 0; } return 0; }