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24 lines
526 B
C++
24 lines
526 B
C++
#include <bits/stdc++.h>
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using namespace std;
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const int mod = 998244353;
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long long n, m;
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long long phi(long long x) {
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long long ans = x;
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for (long long i = 2; i * i <= x; i++)
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if (x % i == 0) {
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ans = ans / i * (i - 1);
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while (x % i == 0) x /= i;
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}
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if (n > 1) ans = ans / x * (x - 1);
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return ans;
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}
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int main() {
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scanf("%lld%lld", &n, &m);
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printf("%lld\n", (long long)(n % mod) * (m % mod) % mod * (phi(n) % mod) % mod * (phi(m) % mod) % mod);
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return 0;
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} |