#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);
	}
	
	
} 
/**************************************************************
	Problem: 1624
	User: linzihang
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/