#include<bits/stdc++.h> using namespace std; int a1,b1,a2,b2,sum; int main(){ scanf("%d %d",&a1,&b1); a2=a1%10,b2=b1%10; a1/=10,b1/=10; int sum=a1*b1+a2*b2+a1*b2+a2*b1; printf("%d\n",sum); return 0; }