#include<iostream>
#include<vector>
using namespace std;
int sum(vector<int>* a, int i)
{
int z=0;
for(vector<int>::iterator it=a->begin();it != a->end();it++)
{
z = *it+z;
}
return z;
}
int main(int argc, char** argv)
{
vector<int> a;
int c;
for(int b=0;b<5;b++)
{
cin>>c;
a.push_back(c);
}
int b = a.size();
cout<<sum(&a,b)<<endl;
return 0;
}