Sum of ones

#include "iostream"

int main() {
    int n;
    std::cin >> n;
    long total = 0;
    for (long i = 1; i <= n ; i++) {
        long num = i;
        while (num >= 0) {
            total += (num % 2);
            num /= 2;
        }
    }
    std::cout << total << std::endl;
}

Test 1

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Test 2

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Test 3

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Test 4

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Test 10

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Test 18

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Test 20

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Test 21

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