张北辰Orz 张北辰Orz 张北辰Orz

import java.util.Scanner;  
public class Main {  
    public static void main(String[] args) {  
        Scanner scanner=new Scanner(System.in);
        int a=scanner.nextInt(); 
        int b=scanner.nextInt();
        int c=scanner.nextInt();
        int ans=(int)(a*0.2+b*0.3+c*0.5);
        System.out.println(ans);
        scanner.close();  
    }  
}

#include<bits/stdc++.h>
using namespace std;
int a,b,c;
int main(){
	cin>>a>>b>>c;
	cout<<0.2*a+0.3*b+0.5*c;
	return 0;
}