Impostor Chances

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);

        System.out.print("Impostors: ");
        int imp = s.nextInt();

        while (imp > 3 || imp < 1) {
            System.err.println("There can only be 1, 2, or 3 impostors!");
            System.out.print("Impostors: ");
            imp = s.nextInt();
        }

        System.out.print("Players: ");
        double plrs = s.nextInt();

        if (imp == 1) {
            while (plrs < 4 || plrs > 10) {
                System.err.println("Player count must be between 4 and 10!");
                System.out.print("Players: ");
                plrs = s.nextInt();
            }
        }
        else if (imp == 2) {
            while (plrs < 7 || plrs > 10) {
                System.err.println("Player count must be between 7 and 10!");
                System.out.print("Players: ");
                plrs = s.nextInt();
            }
        }
        else {
            while (plrs < 9 || plrs > 10) {
                System.err.println("Player count must be 9 or 10!");
                System.out.print("Players: ");
                plrs = s.nextInt();
            }
        }

        System.out.print("Party: ");
        double party = s.nextInt();

        while (party > plrs || party < 1) {
            System.err.println("Party has to have at least 1 member, and cannot be larger than the player count!");
            System.out.print("Party: ");
            party = s.nextInt();
        }

        if (imp == 1) {
            int simplify = simplifyFraction(party, plrs);
            party /= simplify;
            plrs /= simplify;

            System.out.println("Chances for 1 player: " + (party/plrs)*100 + "% (" + (int) party + "/" + (int) plrs + ")");
        }
        else if (imp == 2)
            twoImp(plrs, party);
        else
            threeImp(plrs, party);

        s.close();
    }

    static void twoImp(double plrs, double party) {
        double combos = 0;

        for (double i = plrs - 1; i > 0; i--) {
            combos += i;
        }

        double sum1 = 0;

        for (double i = plrs - 1; i >= plrs - party; i--) {
            sum1 += i;
        }

        int simplify = simplifyFraction(sum1, combos);
        sum1 /= simplify;
        double tmp = combos / simplify;

        System.out.println("Chances for 1 player: " + (sum1/tmp)*100 + "% (" + (int) sum1 + "/" + (int) tmp + ")");

        if (party >= 2) {
            double sum2 = 0;

            for (double i = party - 1; i >= 1; i--) {
                sum2 += i;
            }

            simplify = simplifyFraction(sum2, combos);
            sum2 /= simplify;
            tmp = combos / simplify;

            System.out.println("Chances for 2 players: " + (sum2/tmp)*100 + "% (" + (int) sum2 + "/" + (int) tmp + ")");
        }
    }

    static void threeImp(double plrs, double party) {
        double combos = 0;

        for (double i = plrs - 2; i >= 1; i--) {
            for (double j = i; j >= 1; j--) {
                combos += j;
            }
        }

        double sum1 = 0;

        for (double i = plrs - 2; i >= plrs - 2 - (party - 1); i--) {
            for(double j = i; j >= 1; j--) {
                sum1 += j;
            }
        }

        int simplify = simplifyFraction(sum1, combos);
        sum1 /= simplify;
        double tmp = combos / simplify;

        System.out.println("Chances for 1 player: " + (sum1/tmp)*100 + "% (" + (int) sum1 + "/" + (int) tmp + ")");

        if (party >= 2) {
            double sum2 = 0;

            for (double i = plrs - 2; i >= plrs - party; i--) {
                for (double j = i; j >= plrs - party; j--) {
                    sum2 += j;
                }
            }

            simplify = simplifyFraction(sum2, combos);
            sum2 /= simplify;
            tmp = combos / simplify;

            System.out.println("Chances for 2 players: " + (sum2/tmp)*100 + "% (" + (int) sum2 + "/" + (int) tmp + ")");
        }

        if (party >= 3) {
            double sum3 = 0;

            for (double i = party - 2; i >= 1; i--) {
                for (double j = i; j >= 1; j--) {
                    sum3 += j;
                }
            }

            simplify = simplifyFraction(sum3, combos);
            sum3 /= simplify;
            tmp = combos / simplify;

            System.out.println("Chances for 3 players: " + (sum3/tmp)*100 + "% (" + (int) sum3 + "/" + (int) tmp + ")");
        }
    }

    static int simplifyFraction(double a, double b) {
        while (a != b) {
            if (a > b)
                a -= b;
            else
                b -= a;
        }

        return (int) b;
    }

}