#include <iostream>
#include <vector>
#include <numeric>

using namespace std;

int main(){
    int a, b, tmp;
    vector<int> v;
    
    while(cin >> tmp){
        v.push_back(tmp);
    }
    
    int ans = accumulate(v.begin(), v.end(), 0);
    
    cout << ans << endl;
    
    return 0;
}