<?php
    $n = trim(fgets(STDIN));
    $node = array();
    for( $i = 1; $i <= $n; $i++ ){
        $node[$i] = 0;
    }
    $ans = 0;
    for( $i = 0; $i < ( $n - 1 ); $i++ ){
        list( $a, $b ) = sscanf( trim(fgets(STDIN)), "%d %d" );
        if ( ++$node[$a] > 2 ){
            $ans += $node[$a] - 2;
        }
        if ( ++$node[$b] > 2 ){
            $ans += $node[$b] - 2;
        }
    }
	print $ans."\n";