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public class Hello{
    public static void Main(){
        // 自分の得意な言語で
        // Let's チャレンジ！！
        var line = int.Parse(System.Console.ReadLine());
        long total = 0;
        for (var i=0; i<line; i++)
        {
            var buf = System.Console.ReadLine().Split(' ');
            var needs = int.Parse(buf[0]);
            var current = int.Parse(buf[1]);
            var amount = int.Parse(buf[2]);
            if (current < needs)
            {
                total += (needs - current) * amount;
            }
        }
        System.Console.WriteLine("{0}", total);
    }
}