#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdint.h>
#include <inttypes.h>

enum
{
    MIN_ARGS = 2,
    SHIFT = 256,
    SIZE = 2
};

int
main(int argc, char *argv[])
{
    int fd;

    if (argc < MIN_ARGS ||
            (fd = open(argv[1], O_RDONLY)) == -1) {
        return 1;
    }

    uint8_t tmp[SIZE];
    uint16_t min = 0, min_tmp;
    int flag = 1;

    while (read(fd, &tmp, sizeof(tmp))) {
        min_tmp = tmp[0] * SHIFT + tmp[1];

        if (min_tmp % 2 == 0 && (flag || min_tmp < min)) {
            min = min_tmp;
            flag = 0;
        }
    }

    if (!flag) {
        printf("%"PRIu16"\n", min);
    }
    return 0;
}