#include<bits/stdc++.h> using namespace std; int n,a2[301],b2[301],t,c[301],i; char a[301],b[301]; int change(char c){ if(c>='0'&&c<='9')return c-48; else if(c=='A')return 10; else if(c=='B')return 11; } int main(){ cin>>n>>a>>b; t=max(strlen(a),strlen(b)); for(i=0;i<strlen(a);i++)a2[strlen(a)-i]=change(a[i]); for(i=0;i<strlen(b);i++)b2[strlen(b)-i]=change(b[i]); for(i=1;i<=t;i++){ c[i]+=(a2[i]+b2[i]); c[i+1]+=c[i]/n; c[i]%=n; } bool ch; for(i=(t+1);i>0;i--){ if(i==(t+1)&&c[i]==0)continue; printf("%d",c[i]); } return 0; }