boxWidth=int(input())
blockCount=int(input())

blockWidthes=list(map(int,input().split()))

# 昇順ソート
blockWidthes.sort();

maxCount = 0
currentWidth = 0
for width in blockWidthes:
	currentWidth += width
	if boxWidth < currentWidth:
		break
	maxCount += 1


print( maxCount )