/*
7-8 ?????????????
?? 10
?? ??
?? ??????
????????,????n???????a?,?????a??????x?????a?????x????,????????????????(???0??);??????,??“Not Found”?

????:
????1?????????n(1=n=100)?????x,?2???n???,??????????????????????????

????:
????,???x??????????????;??????,??????“Not Found”?

????1:
5 9
2 9 8 1 9
????1:
4
????2:
10 101
2 8 10 1 9 8 -101  0  98762  1
????2:
Not Found
*/

#include<stdio.h>
int main(){
	int n,x,i,cnt=0,max;
	scanf("%d %d",&n,&x);
	int a[n];
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
	}
	for(i=0;i<n;i++){
		if(a[i]==x){
			max=i;
			cnt++;
	}
}
	if(cnt==0) printf("Not Found\n");
	else printf("%d",max);
	return 0;
}