#include<bits/stdc++.h> using namespace std; int main() { int p,e,i,d; cin>>p>>e>>i>>d; for(int j=1;j<=924;j++){ for(int q=1;q<=759;q++){ for(int z=1;z<=644;z++){ if(p+j*23==e+q*28 && p+j*23==i+z*33) printf("the next triple peak occurs in %d days.\n",p+j*23-d); } } } return 0; }