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