#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
 LL a,b; cin>>a>>b;
 LL ans;
 if(b<0){
  ans=a-b;
 }
 else{
  LL d=10; while(d<=b) d*=10;
  ans = a*d + (a/abs(a))*b;
 }
 cout<<ans<<endl;
 return 0;
}