#include #include struct Prime { int max_n; std::vector primes; std::vector isp; explicit Prime(int max_n) : max_n(max_n), isp(max_n + 1, true) { isp[0] = isp[1] = false; for (int i = 2; i * i <= max_n; ++i) { if (isp[i]) { for (int j = i; i * j <= max_n; ++j) { isp[i * j] = false; } } } for (int p = 2; p <= max_n; ++p) { if (isp[p]) primes.push_back(p); } } template bool isprime(T n) const { if (n <= max_n) return isp[n]; for (T p : primes) { if (p * p > n) break; if (n % p == 0) return false; } return true; } template std::vector> factorize(T n) const { std::vector> facts; for (T p : primes) { if (p * p > n) break; if (n % p != 0) continue; int exp = 0; while (n % p == 0) { n /= p; ++exp; } facts.emplace_back(p, exp); } if (n > 1) { facts.emplace_back(n, 1); } return facts; } }; const Prime P(1000000); using lint = long long; void solve() { int n, l; std::cin >> n >> l; lint ans = 0; for (auto p : P.primes) { int r = l - (n - 1) * p; if (r < 0) break; ans += r + 1; } std::cout << ans << std::endl; } int main() { std::cin.tie(nullptr); std::ios::sync_with_stdio(false); solve(); return 0; }