include

include

include

include

include

include

include

include

include

include

char* readline(); char* ltrim(char*); char* rtrim(char*);

int parse_int(char*);

int main() { int n = parse_int(ltrim(rtrim(readline())));

return 0;

}

char* readline() { size_t alloc_length = 1024; size_t data_length = 0;

char* data = malloc(alloc_length);

while (true) {
    char* cursor = data + data_length;
    char* line = fgets(cursor, alloc_length - data_length, stdin);

    if (!line) {
        break;
    }

    data_length += strlen(cursor);

    if (data_length < alloc_length - 1 || data[data_length - 1] == '\n') {
        break;
    }

    alloc_length <<= 1;

    data = realloc(data, alloc_length);

    if (!data) {
        data = '\0';

        break;
    }
}

if (data[data_length - 1] == '\n') {
    data[data_length - 1] = '\0';

    data = realloc(data, data_length);

    if (!data) {
        data = '\0';
    }
} else {
    data = realloc(data, data_length + 1);

    if (!data) {
        data = '\0';
    } else {
        data[data_length] = '\0';
    }
}

return data;

}

char* ltrim(char* str) { if (!str) { return '\0'; }

if (!*str) {
    return str;
}

while (*str != '\0' && isspace(*str)) {
    str++;
}

return str;

}

char* rtrim(char* str) { if (!str) { return '\0'; }

if (!*str) {
    return str;
}

char* end = str + strlen(str) - 1;

while (end >= str && isspace(*end)) {
    end--;
}

*(end + 1) = '\0';

return str;

}

int parse_int(char* str) { char* endptr; int value = strtol(str, &endptr, 10);

if (endptr == str || *endptr != '\0') {
    exit(EXIT_FAILURE);
}

return value;

}