#include <iostream> #include<cstdio> using namespace std; int main(){ double a,b,c,d,e,f,g,h,i,j,k,l; double m; cin>>a>>b>>c>>d>>e>>f>>g>>h>>i>>j>>k>>l; d = (a+b+c+d+e+f+g+h+i+j+k+l)/12.0; printf("%.2f","￥d"); }