int n = in.nextInt();
int m = in.nextInt();
int[][] a = new int[n][m];

int value = 0;
for (int j = 0; j < m; j++) {
	for (int i = 0; j - i >= 0 && i < n; i++) {
		a[i][] = value;
		value++;
	}
}
for (int i = 1; i < n; i++) {
	for (int j = ;  && m - 1 - j >= 0; j++) {
		a[i + j][] = value;
		value++;
	}
}