#include <iostream>
using namespace std;

int main() {
    int firstDayCoins;
    cin >> firstDayCoins;

    int thousands = firstDayCoins / 1000;
    int hundreds = (firstDayCoins / 100) % 10;
    int tens = (firstDayCoins / 10) % 10;
    int units = firstDayCoins % 10;

    int secondDayCoins = thousands + hundreds + tens + units;
    int totalCoins = firstDayCoins + secondDayCoins;

    cout << totalCoins << endl;

    return 0;
}    
/**************************************************************
	Problem: 1617
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/