#include<stdio.h>
#include<stdlib.h>
int compare(const void *a, const void *b) {
    float fa = *(float*)a;
    float fb = *(float*)b;
    if(fa < fb) return -1;
    if(fa > fb) return 1;
    return 0;
}
int main() {
    int M,N;
    scanf("%d %d",&M,&N);
    if(M <= 0|| N <=0) {
        printf("Invalid input\n");
        return 0;
    }