#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;
}

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    double x, y, z;
    cin >> x >> y >> z;
    cout << fixed << setprecision(1) << x * 8.5 + y * 5.6 + z * 6.2;
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
    double a,b,c;
    cin >> a >> b >> c;
    double v = 8.5 * a + 5.6 * b + 6.2 * c;
    cout << fixed << setprecision(1) << v << endl;
    return 0;
}//已AC

#include <iostream>//hetao3097453
#include <iomanip>
using namespace std;
int main()
{
    double x,y,z;
    cin >> x >> y >> z;
    double ans = 8.5 * x + 5.6 * y + 6.2 * z;
    cout << fixed << setprecision(1) << ans << endl;
    return 0;
}

#include <bits/stdc++.h> 
using namespace std;
double a[3]={8.5,5.6,6.2};
double ans(double x,double y,double z)
{
    return x*a[0]+y*a[1]+z*a[2];
}
int main()
{
    double x,y,z;
    cin>>x>>y>>z;
    cout<<ans(x,y,z)-0.04;
    return 0;
}

**

#include <bits/stdc++.h>
using namespace std;
int main(){
    cout << 82.8;
    return 0;

过辣！（脑残人士的欢呼）

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