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#include<bits/stdc++.h>
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using namespace std;
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int main()
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{
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int count = 0;
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long long n;//定义64位长整型数
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scanf("%lld", &n);//此处"%lld"也可写成"%I64d"
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while(n > 1)
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{
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if(n%2 == 1) n = n * 3 + 1;
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else n /= 2;
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count++;
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}
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printf("%d\n", count);
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return 0;
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}
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