Catholics number it as three.
CCT 2153 THE THIRD COMMANDMENT: "Remember that thou keep holy the sabbath day. Six days shalt thou labour, and do all thy works; but on the seventh day is the sabbath of the lord thy god; thou shalt do no work on it, neither thou nor thy son, nor thy daughter, nor thy man-servant, nor thy maid-servant, nor thy beast, nor the stranger that is within thy gates. For in six days the lord made heaven and earth, and the sea, and all things that are in them, and rested on the seventh day; wherefore the lord blessed the seventh day and sanctified it."