/* -*- coding: utf-8 -*- * * 1084.cc: No.1084 積の積 - yukicoder */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; /* constant */ const int MAX_N = 100000; const int MAX_A = 1000000000; const int MOD = 1000000007; /* typedef */ typedef long long ll; /* global variables */ int as[MAX_N], ps[MAX_N + 1], qs[MAX_N + 1]; /* subroutines */ inline int powmod(int a, int n) { // a^n % MOD int pm = 1; while (n > 0) { if (n & 1) pm = (ll)pm * a % MOD; a = (ll)a * a % MOD; n >>= 1; } return pm; } inline int invmod(int a) { return powmod(a, MOD - 2); } /* main */ int main() { int n; scanf("%d", &n); ps[0] = qs[0] = 1; for (int i = 0; i < n; i++) { scanf("%d", as + i); if (as[i] == 0) { puts("0"); return 0; } ps[i + 1] = (ll)ps[i] * powmod(as[i], n - i) % MOD; qs[i + 1] = (ll)qs[i] * as[i] % MOD; } int ans = 1; for (int i = 0, j = 0, f = 1; i < n; i++) { while (j < n && (ll)f * as[j] < MAX_A) f *= as[j++]; int p0 = (ll)ps[j] * invmod(ps[i]) % MOD; int q0 = (ll)qs[j] * invmod(qs[i]) % MOD; ans = (ll)ans * ((ll)p0 * invmod(powmod(q0, n - j)) % MOD) % MOD; f /= as[i]; } printf("%d\n", ans); return 0; }