#include <iostream>
using namespace std;
int main(){
	long long n,m;
	cin>>n>>m;
	if(n<1000) cout<<"0"<<endl;
	else if(n%m==0) cout<<n/m<<endl;
	else if(n%m!=0){
		long long z=(n/m)/1000;
		cout<<z*1000<<endl;
	}
	return 0;
}