def diceroll(str)
	wstr = str.split(//)
	a = 0
	tempa = ""
	b = 0
	tempb = ""
	c = 0
	if wstr[0] == "d"
		a = 1
	else
		for i in wstr
			if i != "d"
				tempa = tempa.concat(i)
			elsif i == "d"
				break
			end
		end
		a = tempa.to_i
	end
	for i in 0..wstr.length-1
		if wstr[i] == "+" or wstr[i] == "-"
			b = (wstr[i+1,wstr.length-1].join).to_i
			break
		end
	end
	tempina = 0
	tempinb = 0
	for i in 0..wstr.length-1
		if wstr[i] == "d"
			tempina = i
		elsif wstr[i] == "+" or wstr[i] == "-"
			tempinb = i
		end
	end
	c = ((wstr[tempina+1,tempinb-1]).join).to_i
	retnum = 0
	while retnum < a
		retnum = rand(b)
	end
	for i in 0..wstr.length-1
		if wstr[i] == "+"
			retnum = retnum + c
		elsif wstr[i] == "-"
			retnum = retnum - c
		end
	end
	retnum
end

puts diceroll("d34-15")
puts diceroll("4d45+26")

-31
66