C# Calculating sp/min&hour

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace ReadMemory_GUI_
{
    public partial class Form1 : Form
    {
        int currentsp;
        int startingsp;
        int sptotal;
        int sec = 0;



        public Form1()
        {
            InitializeComponent();





        }


        private void timer1_Tick(object sender, EventArgs e)
        {

            Memory mem = new Memory("sro_client");


            string charactername = mem.ReadString(0xF9E9B8);
            string servername = mem.ReadString(0xF9E8B8);
            string[] lines = System.IO.File.ReadAllLines("exp.txt");
            int maxhp = mem.ReadOffset(0xFB970C, 0x460);
            int curhp = mem.ReadOffset(0xFB970C, 0x468);
            currentsp = mem.ReadOffset(0xFB970C, 0x888);
            int maxmp = mem.ReadOffset(0xFB970C, 0x464);
            int curmp = mem.ReadOffset(0xFB970C, 0x45C);
            int currentexp = mem.ReadOffset(0xFB970C, 0x878);
            int lv = mem.ReadOffset(0xFB970C, 0x874);
            decimal lving = (((decimal)currentexp / decimal.Parse(lines[lv - 1])) * 100);


            label1.Text = "CharacterName:" + charactername;
            label2.Text = "Maximum HP:" + maxhp;
            label3.Text = "Current HP:" + curhp;
            label4.Text = "Maximum MP:" + maxmp;
            label5.Text = "Minimum MP:" + curmp;
            label6.Text = "Skill Points:" + currentsp;
            label7.Text = "Exp:" + lving.ToString("f2") + "%";
            label8.Text = "Level:" + lv;
            label9.Text = "Server:" + servername;

        }
        public void Main()
        {
            startingsp = currentsp;
        }

        public void timer2_Tick(object sender, EventArgs e)
        {

            sptotal = currentsp - startingsp;
            sec++;
            int spmin = ((60 * sptotal) / sec);
            int sphour = ((3600 * sptotal) / sec);
            label10.Text = "SP/min:" + spmin;
            label11.Text = "SP/hour:" + sphour;
            label12.Text = "Value:" + sec;
        }
    }
}