#define f(q)for(i[q]=i[q-1];--i[q];)
d[70],a[4],i[4]={31},j,m=9,*p;main(t){for(;~scanf("%d",a+j++););f(1)f(2)f(3){for(t=70;t--;d[t]=!t);for(t=0;t<31;t++)for(!d[t]?d[t]=9:0,j=4;--j;)!*(p=d+t+i[j])|*p>d[t]?*p=d[t]+1:0;for(t=j=4;j--;t+=d[a[j]]-2);m>t?m=t:0;}j=!printf("%d",m);}