#include <stdio.h> #include <iostream> #include <string.h> #include <string> #include <algorithm> using namespace std; int main() { int i, n, k = 0, a[1000] = { 0 }; for (int i = 1; i < 1000; i++) { a[i] = a[i - 1] + k; if (i % 2 == 0) { k++; } } while (cin >> n) { cout << a[n] << endl; } } |
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