#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 a,s,d,f,g,h,j; cin>>a>>s>>d>>f>>g>>h>>j; cout<<(a+s+d+f+g+h+j)/7; return 0; }