using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[] LList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => int.Parse(ReadLine())).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = ReadLine().Split();
        var w = int.Parse(c[0]) / 10;
        var z = int.Parse(c[1]) / 10;
        var b = (int)(double.Parse(c[2]) * 10);
        WriteLine((w + z) * (10 + b));
    }
}