#include<bits/stdc++.h>
using namespace std;
int main(){
    float a,b,c;
    cin>>a>>b>>c;
    if((a+b+c)>=200){
        printf("%.1f",(a+b+c)*0.8);
    }else{
        printf("%.1f",(a+b+c)*0.9);
    }
     return 0;
} 
/**************************************************************
	Problem: 1624
	User: panjinyan
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/