#include <stdio.h>
#include <stdlib.h>

bool find(FILE* f);

int main() {
    FILE* in = fopen("input.txt", "r");
    if (in == NULL) {
        perror("Could not open input file");
        return (-1);
    }

    bool found = find(in);
    fclose(in);

    FILE* out = fopen("output.txt", "w");
    if (in == NULL) {
        perror("Could not open output file");
        return (-1);
    }

    const char* res;
    if (found)
        res = "true";
    else
        res = "false";
    fprintf(out, "%s\n", res);
    fclose(out);
    return 0;
}

bool find(FILE* f) {
    int x;
    if (fscanf(f, "%d", &x) != 1) {
        perror("Incorrect input file");
        exit(-1);
    }

    bool found = false;
    int a;
    while (!found && fscanf(f, "%d", &a) == 1) {
        if (a == x)
            found = true;
    }
    return found;
}