#include<bits/stdc++.h> using namespace std; int n,m,ans; int main(){ // freopen("J2.in","r",stdin); // freopen("J2.out","w",stdout); scanf("%d%d",&n,&m); ans+=(n/10)*(m/10)+(n/10)*(m%10)+(n%10)*(m/10)+(n%10)*(m%10); printf("%d\n",ans); return 0; }