#include <stdio.h>
#include <stdbool.h>
int is_alternating_pattern(int *mem, int k) {
bool isPatternDetected = false;
bool next_value=0, current_value =0;
for(int i=0; i<k-1 ;i++)
{
current_value = *mem;
next_value = *(mem+1);
if(current_value==next_value)
{
return 0;
}
mem++;
}
return 1;
}
int main() {
int n, k, arr[100];
scanf("%d %d", &n, &k);
for (int i = 0; i < n; i++) {
scanf("%d", &arr[i]);
}
int res = is_alternating_pattern(arr, k);
printf("%d", res);
return 0;
}