#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,a[1501]; double s=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } for(int i=1;i<=n;i++){ if(a[i]<=70) s+=0.1; else if(a[i]%70==0) s+=a[i]/70*0.1; else if(a[i]%70!=0) s+=a[i]/70*0.1+0.1; } printf("%.1lf",s); return 0; }