---

#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;
}