#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; double fee(int m){ double money=0; while(m>0){ m=m-70; money+=0.1; } return money; } int main(){ int n,number; double ans=0; cin>>n; for(int i=1;i<=n;i++){ cin>>number; ans+=fee(number); } printf("%.1lf\n",ans); return 0; }