#!/usr/bin/perl

$min_time = 999999.9;

while (<>) {
    if ( /([0-9]+:)?([0-9.]+)user.*?([0-9]+:)?([0-9.]+)system/ ) {
	$t = $1 * 60 + $2 + $3 * 60 + $4;
	if ($t < $min_time) {
	    $min_time = $t;
	}
    }
}

print "$min_time\n";