#include<iostream> #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int n,a; double s=0; int main(){ cin>>n; for(int i=1;i<=n;i++){ cin>>a; while(a>0){ s+=0.1;a-=70; } } printf("%.1f",s); return 0; }