#include <stdio.h>
#include <string.h>
int main(void) {
	int n = 0;
	scanf("%d",&n);
    char searchStr[10000] = "a";
	scanf("%s",searchStr);
    char *result = strstr(searchStr, "404");
    if(result != NULL) {
        printf("Found");
    } else {
        printf("NotFound");
    }
    return 0;
}