#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int p,e,i,d,t; while(cin>>p>>e>>i>>d&&p!=-1){ ++t; int k; for(k=d+1;(k-p)%23;++k) for(;(k-e)%28;k+=23){ cout<<t<<endl; } return 0; }