//Evaluate expressions of the type 
//  1 + 4 + 5 + 7 =
#include <iostream>

using namespace std;

int main()
{
	//declare variables
	int n, t=0;
	char c;

	//Operation
	do
	{
		cin >> n >> c;
		t= t+n;
	}while(c!='=');
	
	//output
	cout << t << endl;

	return 1;
}