mirror of
https://git.sb/baoshuo/OI-codes.git
synced 2024-12-26 17:52:00 +00:00
24 lines
526 B
C++
24 lines
526 B
C++
|
#include <bits/stdc++.h>
|
||
|
|
|
||
|
|
using namespace std;
|
||
|
|
|
||
|
|
const int mod = 998244353;
|
||
|
|
|
||
|
|
long long n, m;
|
||
|
|
|
||
|
|
long long phi(long long x) {
|
||
|
|
long long ans = x;
|
||
|
|
for (long long i = 2; i * i <= x; i++)
|
||
|
|
if (x % i == 0) {
|
||
|
|
ans = ans / i * (i - 1);
|
||
|
|
while (x % i == 0) x /= i;
|
||
|
|
}
|
||
|
|
if (n > 1) ans = ans / x * (x - 1);
|
||
|
|
return ans;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main() {
|
||
|
|
scanf("%lld%lld", &n, &m);
|
||
|
|
printf("%lld\n", (long long)(n % mod) * (m % mod) % mod * (phi(n) % mod) % mod * (phi(m) % mod) % mod);
|
||
|
|
return 0;
|
||
|
|
}
|