// Pantea Aria


// recap - while

// read numbers until user enters -1, then print out their sum

// what do we need to calculate?
// 10, 30, -5, 90, 34, -1
// sum = (10+30+-5+90+34)




#include <stdio.h>

int main(void) {

    int number = 0;
    int sum = 0;
    while (number != -1) {
        scanf ("%d", &number);
        sum = sum + number;
    }    
    printf ("Sum is %d\n", sum + 1);
    return 0;
}