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3 years ago
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#include <iostream> using namespace std; int main() { int l, i, b, с, d, f = 0; cin>> l; if (l > 0 && l != 0) { for (i = 1; i <= l; i++) f += i; } else { for (i = 1; i >= l; i--) f += i; } cout<< f; }
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