#include <iostream>
using namespace std;


/*
 * Recursive routine to compute sum of first n integers.
 */
long s( int n )
{
    if( n == 1 )
        return 1;
    else
        return s( n - 1 ) + n;
}

int main( int argc, char *argv[] )
{
    for( int i = 1; i < 10; i++ )
        cout << s( i ) << endl;


    return 0;
}