#include<stdio.h>
main(){
    long long N,K;
    scanf("%lld%lld",&N,&K);
    int dif = 0;
    for(int i = 1;i <= N;i++){
        int d;
        scanf("%d",&d);
        dif += d!=i;
    }
    K -= (dif/2+dif%2);
    if(K < 0){
        printf("NO\n");
        return 0;
    }
    if(K%2){
        printf("YES\n");
    }else{
        printf("NO\n");
    }
}