#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int n; double sum=0; cin>>n; int a[n+1]; for(int i=1;i<=n;i++){ cin>>a[i]; } for(int i=1;i<=n;i++){ if(a[i]>70){ if(a[i]%70!=0) sum+=a[i]/70+1; else sum+=a[i]/70; }else sum++; } cout<<sum*0.1; return 0; }