import java.math.BigInteger; import java.util.Scanner; public class Sol { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = scanner.nextInt(); int[] A = new int[n]; for (int i = 0; i < n; i++) { A[i] = scanner.nextInt(); } BinaryIndexedTree ft = new BinaryIndexedTree(n); long[] factSum = new long[n]; factSum[1]++; for (int i = 0; i < n - 1; i++) { int a = A[i]; int cnt = a-1-ft.sum(a); int len = n - i; factSum[len-1] += cnt; ft.add(a, 1); } BigInteger ans = BigInteger.ZERO; BigInteger fact = BigInteger.ONE; for (int i = 1; i < n; i++) { fact = fact.multiply(BigInteger.valueOf(i)); ans = ans.add(fact.multiply(BigInteger.valueOf(factSum[i]))); } System.out.println(ans); } } class BinaryIndexedTree { private int n; private int[] val; public BinaryIndexedTree(int n) { this.n = n; val = new int[n]; } public void add(int i, int x) { for (; i < n; i |= i + 1) val[i] += x; } int sum(int i) { int s = 0; --i; if (i >= n) i = n - 1; for (; i >= 0; i = (i & (i + 1)) - 1) s += val[i]; return s; } }