#include <bits/stdc++.h>
#define int long long
using namespace std;

signed main()
{
    ios::sync_with_stdio(false);
    int n,count=0,i=0,t;
    cin>>n;
    if(!n)
    {
        cout<<1;
        return 0;
    }
    while(count!=n)
    {
        i+=5;
        t=i;
        while(t%5==0)
        {
            count++;
            t=t/5;
        }
    }
    if(count==n)
    {
        cout<<i;
    }
    else
    {
        cout<<"No solution";
    }
    return 0;
}