#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
vector<int> v;
string s;
int a,b,c;
for(int i=100;i<=919;i++)
{
s = to_string(i);
a = s[0]-'0';
b = s[1]-'0';
c = s[2]-'0';
if(a*b==c)
{
v.push_back(i);
}
}
for(auto x : v)
{
if(n <= x)
{
cout << x << endl;
break;
}
}
return 0;
}
I2luY2x1ZGUgPGJpdHMvc3RkYysrLmg+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7CgppbnQgbWFpbigpIHsKCWludCBuOwoJY2luID4+IG47CgkKCXZlY3RvcjxpbnQ+IHY7CglzdHJpbmcgczsKCWludCBhLGIsYzsKCWZvcihpbnQgaT0xMDA7aTw9OTE5O2krKykKCXsKCQlzID0gdG9fc3RyaW5nKGkpOwoJCWEgPSBzWzBdLScwJzsKCQliID0gc1sxXS0nMCc7CgkJYyA9IHNbMl0tJzAnOwoJCQoJCQoJCWlmKGEqYj09YykKCQl7CgkJCXYucHVzaF9iYWNrKGkpOwoJCX0KCX0KCWZvcihhdXRvIHggOiB2KQoJewoJCWlmKG4gPD0geCkKCQl7CgkJCWNvdXQgPDwgeCA8PCBlbmRsOwoJCQlicmVhazsKCQl9Cgl9CgkKCQoJcmV0dXJuIDA7Cn0=