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#include <stdio.h>
#include <map>
using namespace std;

int main(int argc, char const *argv[]) {
  int bottlesNum, leftNum, uniquesNum = 0, diff, result = 0, i;
  map<int, bool> brandSetup;

  if (!scanf("%d %d", &bottlesNum, &leftNum)) return 1;

  int bottles[bottlesNum], uniques[leftNum];

  for (i = 1; i <= bottlesNum; ++i) {
    brandSetup[i] = false;
  }

  for (i = 0; i < bottlesNum; ++i) {
    if (!scanf("%d", &bottles[i])) return 1;

    if (!brandSetup[bottles[i]]) {
      brandSetup[bottles[i]] = true;
      uniques[uniquesNum++] = i;
    }
  }

  if (leftNum > uniquesNum) {
    printf("-1");
    return 0;
  }

  result = 0;
  diff = 0;
  for (i = 1; i < leftNum; ++i) {
    diff += uniques[i] - uniques[i-1] - 1;
    result += diff;
  }

  printf("%d", result);

  return 0;
}