#include<iostream>
#include <cstring>
using namespace std;
char a[111];
int c=0;
int x; 
int main(){
    gets(a);
    for(int i=0;i<strlen(a);i++){
        if(a[i]!='+'){
        	c=c+(a[i]-'0');
		}
    }
    cout<<c;
    return 0;
}


/**************************************************************
	Problem: 1123
	User: xuanhua
	Language: C++
	Result: Wrong Answer
****************************************************************/