#include<bits/stdc++.h>
using namespace std;
int main(){
    float x,y,z,h;
    cin>>x>>y>>z;
    if(x+y+z>=200){
        h=(x+y+z)*0.8;
        printf("%.1f",h);
    }else{
        h=(x+y+z)*0.9;
        printf("%.1f",h);
    }
}
/**************************************************************
	Problem: 1624
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/