#include <cstdio>
#include <cstdint>
#include <algorithm>

__int128 gcd(__int128 m, __int128 n) {
  while (n) std::swap(m%=n, n);
  return m;
}

int main() {
    intmax_t N;
    scanf("%jd", &N);
    intmax_t M = gcd(N, __int128(N)*(N+1) / 2);
    intmax_t res = 0;
    for (intmax_t i = 1; i*i <= M; ++i) {
        if (M % i == 0) {
            res += i;
            if (i != M / i) res += M / i;
        }
    }
    printf("%jd\n", res);
}