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#include <iostream>
#include <cstring>

int main()
{
	int k, n, tmp;
	std::cin >> n >> k;
	bool cw[n];
	memset(cw, 0, sizeof(cw));
	int sub = 0, num = 0;
	unsigned long long secs = 0;
	for(int i=0;i<n;i++) {
		std::cin >> tmp;
		if(!cw[tmp-1]) {
			cw[tmp-1] = true;
			secs += i - sub++;
			num++;
			if(num == k) break;
		}
	}
	if(num != k) std::cout << -1;
	else std::cout << secs;

	return 0;
}