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#include <cmath>
#include <cstring>
#include <cstdio>
using namespace std;
const int manx = 500005;
int L, M, N, n;
bool (int x)
{
if(x*log10(x)>=n-1)
return 1;
else
return 0;
}
int main()
{
cin >> n;
long long l = 1, r = 2000000001,ans;
while(l<=r)
{
int mid = l + r >> 1;
if(check(mid))
{
r = mid-1;
ans=mid;
}
else
l = mid + 1;
}
cout<<ans<<endl;
}
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