#include <iostream> #include <cstdio> using namespace std; int main() { int n,x,y; scanf("%d %d %d",&n,&x,&y); if(y%x==0){ n=n-(y/x); } else{ n=n-(y/x+1); } if(n<=0){ n=0; } else{ n=n-(y/x+1); } cout<<n; return 0; }