#include <bits/stdc++.h>
int main()
{
long long pow2_58 = 1;
for(int i = 0; i < 58; i++)
pow2_58 *= 2;
int ratio = 1000000000000000000LL/pow2_58;
int ans = log(ratio)/log(3);
std::cout << ans;
return 0;
}
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