不难

#include<bits/stdc++.h>
using namespace std;
int now;
double sum;
int main(){
	scanf("%d",&now);
	sum+=now*28.9;
	scanf("%d",&now);
	sum+=now*32.7;
	scanf("%d",&now);
	sum+=now*45.6;
	scanf("%d",&now);
	sum+=now*78;
	scanf("%d",&now);
	sum+=now*35;
	scanf("%d",&now);
	sum+=now*86.2;
	scanf("%d",&now);
	sum+=now*27.8;
	scanf("%d",&now);
	sum+=now*43;
	scanf("%d",&now);
	sum+=now*56;
	scanf("%d",&now);
	sum+=now*65;
	printf("%.1f",sum);
	return 0;
}