#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
    char j;
	while(j!='\n'){
		int i;
		cin>>i>>j;
		n+=i;
	}
	cout<<n;
}
/**************************************************************
	Problem: 1123
	User: wangyiyang
	Language: C++
	Result: Time Limit Exceed
****************************************************************/