25 lines
381 B
C++
25 lines
381 B
C++
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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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int n;
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cin >> n; //树的高度
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int hour = 0;
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int finish = 0;
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//hour=1--->3
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//hour=2--->3-1
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//hour=3--->3-1+3
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while (finish < n) {
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hour++;
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if (hour % 2 > 0) finish += 3;
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else finish -= 1;
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}
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cout << hour << endl;
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return 0;
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}
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