#include <iostream>
#include<math.h>
#include <iomanip>
#include<cstdio>
#include<string>
#include<map>
#include<vector>
#include<list>
#include<algorithm>
#include<stdlib.h>
#include<iterator>
#include<sstream>
#include<string.h>
using namespace std;


int main()
{
    string a;
    double cnt;
    double money;
    double res=0;
    while(cin>>a>>cnt>>money)
    {
        res=res+money*cnt;

    }
    cout<<fixed<<setprecision(1)<<res<<endl;
    return 0;
}