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

int     doop(char *s1, char *s2, char *s3)
{
    if (s2[0] == '+')
        return (atoi(s1) + atoi(s3));
    if (s2[0] == '-')
        return (atoi(s1) - atoi(s3));
    if (s2[0] == '*')
        return (atoi(s1) * atoi(s3));
    if (s2[0] == '/')
        return (atoi(s1) / atoi(s3));
    if (s2[0] == '%')
        return (atoi(s1) % atoi(s3));
    return (0);
}

int     main(int ac, char **av)
{
    if (ac == 4)
        return (printf("%d\n", doop(av[1], av[2], av[3])));
    return (printf("\n"));
}