C :

#include<stdio.h>

int main()
{
	int p,e,i,d,j,c=0;
	while(scanf("%d%d%d%d",&p,&e,&i,&d),p!=-1)
	{
		for(j=d+1;;j++)
			if((j-p)%23==0&&(j-e)%28==0&&(j-i)%33==0)
				break;
		printf("Case %d: the next triple peak occurs in %d days.\n",++c,j-d);
	}
	return 0;
}

C++ :

#include<stdio.h>

int main()
{
	int p,e,i,d,j,c=0;
	while(scanf("%d%d%d%d",&p,&e,&i,&d),p!=-1)
	{
		for(j=d+1;;j++)
			if((j-p)%23==0&&(j-e)%28==0&&(j-i)%33==0)
				break;
		printf("Case %d: the next triple peak occurs in %d days.\n",++c,j-d);
	}
	return 0;
}

Java :

import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner in=new Scanner(System.in);
        int count = 1;
        while(in.hasNextInt()){
            int p=in.nextInt()%23;
            int e=in.nextInt()%28;
            int i=in.nextInt()%33;
            int d=in.nextInt();
            int day = 0;
            int j = 1, k = 1, l = 1;
            if(p==-1&&e==-1&&i==-1&&d==-1) break;
            while((28*33*j)%23!=1)
                j++;
            while((23*33*k)%28!=1)
                k++;
            while((23*28*l)%33!=1)
                l++;
            day = (28*33*j*p+23*33*k*e+23*28*l*i)%21252;
            if(day==d)
                day = 21252;
            else if(day<d)
                day = 21252-(d-day);
            else
                day = day-d;
            System.out.println("Case "+count+": the next triple peak occurs in "+day+" days.");
            count++;
        }  
    }  
}