> #include<stdio.h>
> main()
> {
> int p[20],e[20],i[20],d[20];
> int a[20][4];
> int j,k,s=0,t,m;
> while(1)
> {
> for(t=0;t<4;t++)
> scanf("%d",&a[s][t]);
> if(a[s][0]==-1) break;
> s++;
> }
> for(j=0;j<s;j++) 
> {
> for(k=1;((a[j][0]+23*k-a[j][1])%28!=0)||((a[j][0]+23*k-a[j][2])%33!=0);k++) ;
>     m=a[j][0]+23*k-a[j][3];
> printf("Case %d: the next triple peak occurs in %d days.\n",j+1,m);
> }
> }