import std;

int readInt() {
	int x;
	readf!" %d"(x);
	return x;
}
int[] readArray(int n) {
	auto a = new int[](n);
	return a.map!(i => readInt).array;
}


void main() {
	int n = readInt;
	int[] p = readArray(n);
	
	long ans = 0;
	auto q = zip(n.iota.array, p);
	
	foreach(i; 0 .. n) {
		int sgn = (p[i] == n ? -1 : 1);
		ans += sgn * (i + 1);
	}
	if(n == 1) ans = 0;
	writeln(ans);
}