_==0 "exec" "gawk" "-f" "$0"
NR==1{ aw=$1;ab=$2 }
NR==2{ bw=$1 }
NR==3{ c=$1;d=$2 }
END{ if (c>ab) { aw=aw-c+ab;bw=bw+c-ab } print aw+(d>bw?bw:d) }