---

#include <stdio.h>

int max(int a, int b) {
    if (a > b) {
        return a;
    }
    return b;
}

int main(void) {
    int a, b;

    if (scanf("%d %d", &a, &b) != 2) {
        printf("n/a");
    } else {
        int c = getchar();

        while (c == ' ' || c == '\t' || c == '\r') {
            c = getchar();
        }

        if (c == '\n' || c == EOF) {
            printf("%d", max(a, b));
        } else {
            printf("n/a");
        }
    }

    return 0;
}