include <stdio.h>

int main() {

int a[15], b[15], i = 0, j = 0, n, m, c = 0, sum = 0;
scanf("%d%d", &n, &m);
while (n > 0) {
	int c = n % 10;
	n = n / 10;
	a[i] = c;
	i++;
}
while (m > 0) {
	int c = m % 10;
	m = m / 10;
	b[j] = c;
	j++;
}
for (int z = 0; z < i; z++) {
	for (int k = 0; k < j; k++) {
		sum = sum + a[z] * a[k];
	}
}
printf("%d", sum);
return 0;

}