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