r=999
read {w..z}
for((a=0;++a<29;)){
for((b=a;++b<30;)){
for((c=b;++c<31;)){
for((i=0;++i<31;)){
t=999
(( i-a>=0 && t>m[i-a]+1 && (t=m[i-a]+1) ))
(( i-b>=0 && t>m[i-b]+1 && (t=m[i-b]+1) ))
(( i-c>=0 && t>m[i-c]+1 && (t=m[i-c]+1) ))
(( m[i]=t ))
}
(( s=m[w]+m[x]+m[y]+m[z], r>s && (r=s) ))
}
}
}
echo $r