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