#include<bits/stdc++.h>
using namespace std;
int main(){
    float a,g,k,l,v;
    scanf("%f %f %f",&a,&g,&k);
    v=a+g+k;
    if(v>=200){
    	l=v*0.8;
	}else{
		l=v*0.9;
	}
	printf("%.1f",l);
	}
/**************************************************************
	Problem: 1624
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2076 kb
****************************************************************/