UVa : 11621 (Small Factors)



// http://uva.onlinejudge.org/external/116/11621.html

// @BEGIN_OF_SOURCE_CODE

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <sstream>
#include <cmath>
#include <bitset>
#include <utility>
#include <set>
#include <numeric>
#define INT_MAX 2147483647
#define INT_MIN -2147483647
#define pi acos(-1.0)
#define N 1000000
#define LL unsigned long long
using namespace std;


int main ()
{
    set <LL> s;
    set <LL> :: iterator it;

    s.insert (2);
    s.insert (3);

    for ( it = s.begin (); it != s.end (); it++ ) {
        if ( (*it) * 2 > (LL) INT_MAX + 3 ) break;
        s.insert ((*it) * 2);
        s.insert ((*it) * 3);
    }

    //cout << "size : " << s.size () << endl;

    LL n;

    while ( cin >> n && n ) {
        if ( n == 1 ) { puts ("1"); continue; }

        for ( it = s.begin (); it != s.end (); it++ ) {
            if ( (*it) >= n ) {
                cout << *it << endl;
                break;
            }
        }
    }

	return 0;
}

// @END_OF_SOURCE_CODE

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