#!/bin/bash
read a # 500
read b # 100
read c # 50
read x # target
c=0
for ((ia=0; ia <= $a; ia++)); do
  for ((ib=0; ib <= $b; ib++)); do
    for ((ic=0; ic <= $c; ic++)); do
      #echo $ia
      #echo $ib
      #echo $ic
      #echo AAA
      #echo $((500*$ia+100*$ib+50*$ic))
      if [ $((500*$ia+100*$ib+50*$ic)) == $x ];then
        c=$(($c+1))
      fi
    done
  done
done
echo $c