#include<bits/stdc++.h> using namespace std; int main(){ long long int n,m,j1=0,j2=0,ans=0,n1[1005],m1[1005];cin>>n>>m; for(long long i=n;i>0;i/=10){ j1++; n1[j1]=i%10; } for(long long i=m;i>0;i/=10){ j2++; m1[j2]=i%10; } for(int i=1;i<=j1;i++){ for(int j=1;j<=j2;j++){ ans+=n1[i]*m1[j]; } } cout<<ans; return 0; }