#include<bits/stdc++.h>
using namespace std;
int main(){
	float a1,a2,a3,b,z;
	cin>>a1>>a2>>a3;
	b=a1+a2+a3;
	if(b>=200){
		z=b*0.8;
		printf("%.1f",z);
	}if(b<200){
		z=b*0.9;
		printf("%.1f",z);
	}
}
/**************************************************************
	Problem: 1624
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/