Star Force encounter chance calculator

EncounterChanceCalc.cs

using System;
using System.Collections.Generic;

namespace EncounterChanceCalc {
	class Program {
		static void Main(string[] args) {
			// SF1
			//decimal rate = 0.10M;
			// SF2 and SF3
			decimal rate = 0.05M;
			decimal pLeft = 1.0M;
			List<decimal> firstSuccessChances = new List<decimal>();
			firstSuccessChances.Add(0);

			decimal p = rate;
			bool last = false;
			for (int i = 0; true; i++) {
				if (rate >= 1.0M) {
					last = true;
				}

				p = pLeft * rate;
				firstSuccessChances.Add(p);
				pLeft *= (1.0M - rate);
				rate += 0.01M;

				if (last) {
					break;
				}
			}

			decimal sum = 0;
			List<decimal> sums = new List<decimal>();
			foreach (decimal chance in firstSuccessChances) {
				sum += chance;
				sums.Add(sum);
			}
			// sum should be 1 at this point

			// calc expected number of trials until first success
			// i.e. expected number of encounter checks until virus battle
			decimal expected = 0;
			for (int i = 0; i < firstSuccessChances.Count; i++) {
				expected += i * firstSuccessChances[i];
			}

			// calculate expected number of movement frames for a number of situations
			// make sure to set proper rate above
			decimal sf1nocloak = 192 + (expected - 1) * 64;
			decimal sf1cloaked = 192 + (expected - 1) * 128;
			decimal sf2nocloak = 250 + (expected - 1) * 10;
			decimal sf3nocloak = 400 + (expected - 1) * 15;
			decimal sf3cloaked1 = 400 + (expected - 1) * 45;
			decimal sf3cloaked2 = 600 + (expected - 1) * 45;

			// calculate expected number of movement frames for using one Cloaker and letting it expire
			decimal sf1singlecloak = 0;
			decimal cloakerFrames = 768 + 191;
			decimal next = 0;
			decimal e = expected;
			for (int i = 0; e > 0; i++, e--) {
				if (i == 0) {
					next = 192;
				} else {
					if (cloakerFrames > 0 && cloakerFrames <= 768) {
						next = 128;
					} else {
						next = 64;
					}
				}

				sf1singlecloak += Math.Min(e, 1) * next;
				cloakerFrames -= next;
			}
		}
	}
}