#include <stdio.h>
#include <stdlib.h>

int main()
{
    printf("Input numbers.  I'll sum them up when you input a non-number.\n");
    double value_read, sum=0;
    while (scanf("%lf", &value_read)) {
        sum += value_read;
    }
    printf("Sum: %f\n",sum);
    return EXIT_SUCCESS;
}