#define Z(i)for(X[i]=X[i-1];++X[i]<31;)
B[99],V[4],X[4],T=98,R,i,r;main(j){scanf("%d%d%d%d",V,V+1,V+2,V+3);R=T;Z(1)Z(2)Z(3){for(j=-1;++j<T;)B[j]=!j;for(i=4;--i;)for(j=X[i];j<T;j++)if((r=B[j-X[i]])*(!B[j]||B[j]>r))B[j]=r+1;for(i=r=0;i<4&&B[V[i]];)r+=B[V[i++]]-1;R=i>3&&R>r?r:R;}R=!printf("%d\n",R);}