25 lines
372 B
C++
25 lines
372 B
C++
#include <bits/stdc++.h>
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#define int long long
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using namespace std;
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int n;
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signed main()
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{
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scanf("%lld", &n);
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int ans = 0;
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for (int i = 0; i < n / 2; ++i)
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{
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ans <<= 1;
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ans += 1;
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}
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for (int i = 0; i < n / 2; ++i)
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{
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ans <<= 1;
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}
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printf("%lld\n", ans);
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return 0;
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}
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/*
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5
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00000
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末尾0的个数等于1的个数
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*/ |