C :

#include<stdio.h>
int main()
{
	float a,b,c;
	scanf("%f%f%f",&a,&b,&c);
	printf("%.1f",a*8.5+b*5.6+c*6.2);
	return 0;
}

C++ :

#include <iostream>
#include <iomanip>
using namespace std;

int main(){
	double x,y,z;
	cin>>x>>y>>z;
	cout<<fixed<<setprecision(1)<<8.5*x+5.6*y+6.2*z;
}

Java :

import java.util.Scanner;

public class Main {
	 
    /**
     * @param args
     */
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		double a = sc.nextDouble();
		double b = sc.nextDouble();
		double c = sc.nextDouble();
		double d = a*8.5 + b*5.6 + c*6.2;
		System.out.println(String.format("%.1f", d));
	}
	public static void printArr(int [] a){
		for (int i = 0 ;i<= a.length - 1 ;i++) {
			System.out.print( a[i] + " ");
		}
	}
}

Python :

s = input().split()
x = float(s[0])
y = float(s[1])
z = float(s[2])
su = 8.5 * x + 5.6 * y + 6.2 * z
print('%.1f' % su)