#include <stdio.h>
int is_alternating_pattern(int *mem, int k) {
// Write your pointer logic here
int status = 0;
int *p = mem;
for(int i = 0; i < k - 1; i++,p++)
{
if( *p == *(p + 1))
{
return status = 0;
}
}
return status = 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;
}