#include #include #include #include #include #include #define FORR(i,b,e) for(int i=(b);i<(int)(e);++i) #define FOR(i,e) FORR(i,0,e) #define ALL(c) begin(c), end(c) #define sortuniq(v) sort(v.begin(), v.end()), v.erase(unique(v.begin(),v.end()),v.end()) #define dump(var) cerr << #var ": " << var << "\n" #define dumpc(con) for(auto& e: con) cerr << e << " "; cerr<<"\n" typedef long long ll; typedef unsigned long long ull; const double EPS = 1e-6; const int d4[] = {0, -1, 0, 1, 0}; using namespace std; int main() { cin.tie(0); ios::sync_with_stdio(false); ll x; cin >> x; map pcnt; ll d = 2; while (x % d == 0) { x /= d; pcnt[d]++; } d = 3; while (d * 3 <= x) { while (x % d == 0) { x /= d; pcnt[d]++; } d += 2; } if (x > 1) pcnt[x]++; ll y = 1; for (auto &p: pcnt) { if (p.second % 2 == 1) y *= p.first; } cout << y << endl; return 0; }