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

int mode = 0;

void
sigint_handler(int signo)
{
    mode = 0;
    signal(SIGINT, sigint_handler);
}

void
sigquit_handler(int signo)
{
    mode = 1;
    signal(SIGQUIT, sigquit_handler);
}

int
main(void)
{
    signal(SIGINT, sigint_handler);
    signal(SIGQUIT, sigquit_handler);
    printf("%d\n", getpid());
    fflush(stdout);
    int res = 0;
    int curr;
    while (scanf("%d", &curr) == 1) {
        res = mode ? res * curr : res + curr;
        printf("%d\n", res);
        fflush(stdout);
    }
    return 0;
}