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