#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,b,c,d,e,f,g,n; cin>>a>>b>>c>>d>>e>>f>>g; n=a+b+c+d+e+f+g; cout<<n/7; return 0; }