x = 50232664853522245305416663465797181880457258025569478559027020637689305266652375982874957282186920039740245544313021979167491414627648054421626450903732301970386214502290904360792618559102961459988990211547239113562240204497934713395939288468603720889369473365578339515548699615181802856501740938959
y = 4201403994187
z = input()
if(z[0]=='4'):
print(y)
else:
print(x)#include<bits/stdc++.h>
using namespace std;
int main(){
string s;
cin >> s;
if(s=="4167792762229302596005813"){
cout << "4201403994187";
}
else cout << "50232664853522245305416663465797181880457258025569478559027020637689305266652375982874957282186920039740245544313021979167491414627648054421626450903732301970386214502290904360792618559102961459988990211547239113562240204497934713395939288468603720889369473365578339515548699615181802856501740938959";
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