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OI-codes/AcWing/873/873.cpp

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#include <bits/stdc++.h>
using namespace std;
int n, x;
int phi(int x) {
int res = x;
for (int i = 2; i * i <= x; i++) {
if (x % i == 0) {
res = res / i * (i - 1);
while (x % i == 0) x /= i;
}
}
if (x > 1) res = res / x * (x - 1);
return res;
}
int main() {
cin >> n;
while (n--) {
cin >> x;
cout << phi(x) << endl;
}
return 0;
}