#include <iostream>
#include <string>
using namespace std;

int main() {
    string expression;
    cin >> expression;

    int total = 0;   
    int current = 0;  

    for (char c : expression) {
        if (isdigit(c)) {
            
            current = current * 10 + (c - '0');
        } else if (c == '+') {
        
            total += current;
            current = 0; 
        }
    }
    total += current; 

    cout  << total << endl;
    return 0;
}