#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define rep(i, n) for (i = 0; i < n; i++)
#define rrep(i, n) for (i = n; i >= 0; i--)
#define max(a, b) (a > b ? a : b)
#define min(a, b) (a < b ? a : b)

int main() {
    long long n, k;
    scanf("%lld %lld", &n, &k);

    int d, ans = 0, i;
    rep(i, n) {
        scanf("%d", &d);
        if (d != i + 1) ans++;
    }

    if (k - (ans - 1) % 2) puts("NO");
    else puts("YES");
    return 0;
}