#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,s;
	float d,k;
	cin>>a>>s;
	d=(s*(a*100000000/1000))/100000000.0;
	k=(d+a/1.0);
	printf("%.4f",k);
}

/**************************************************************
	Problem: 1446
	User: tonghuawei
	Language: C
	Result: Compile Error
****************************************************************/