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#!/usr/bin/env python3
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def radicals(n):
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sieve = [1]*(n+1)
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for p in range(2,n+1):
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if sieve[p] > 1:
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continue
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for m in range(p, n+1, p):
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sieve[m] *= p
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return zip(range(n+1), sieve)
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rads = list(radicals(10**5))
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rads.sort(key = lambda x: x[1])
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print(rads[10**4][0])
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