#include <iostream>
#include <fstream>

using namespace std;

// Function Protype.
int readdata(ifstream &data);

int readdata(ifstream &data){
        int i;

        data >> i;

        return i;
}

int main()
{
    ifstream data;
    int i;
    data.open("data.txt");
    i=readdata(data);
    cout << i << endl;
    data.close();

    return 0;
}