#include <stdlib.h>
#include <ctype.h>
#include <string.h>
int isValidNumber(char *s) {
    int i = 0;
    if (s[0] == '-' || s[0] == '+') i++;
    for (; s[i] != '\0'; i++) {
        if (!isdigit(s[i])) return 0;
    }
    return 1;
}
int main() {
    int n;
    scanf("%d", &n);
    int sensors[n];
    for (int i = 0; i < n; i++) {
        scanf("%d", &sensors[i]);
    }
    char targetStr[101];
    scanf("%s", targetStr);
    if (!isValidNumber(targetStr)) {
        printf("Invalid input\n");
        return 0;
    }
    int target = atoi(targetStr);
    for (int i = 0; i < n; i++) {
        if (sensors[i] == target) {
            printf("Found\n");
            return 0;
        }
    }
    printf("Not found\n");
    return 0;
}