// Program to add numbers until a given sentinel is input.
// Michael Rothstein
// 06/19/2014

#include <iostream>

using std::cin; using std::cout; using std::endl;

int main() {
    int total = 0;   // Contains the sum of all read in numbers.
    int sentinel;
    cout << "What sentinel do you want to use?";
    cin >> sentinel;
    while (1){
        int number;
        cin >> number;
	if( number == sentinel ) break;
        total += number;
    }
    cout << "Sum is " << total << endl;
}