# include<iostream> using namespace std; int a[5001]; int main(){ int x,sum=0; cin>>x; for(int i=1;i<=x;i++){ cin>>a[i]; } for(int i=1;i<=x;i++){ if(a[i]%70!=0)sum+=a[i]/70+1; else{ sum+=a[i]/70; } } printf("%.1lf",sum*0.1); return 0; }