GREENBURGH - A knife-wielding robber needed only $4, so he refused to take a $10 bill from his victim and waited while the man made change at a pizza parlor, police said.

He then took the $4 and ran off, only to be captured a few blocks away, police said Tuesday.

The suspect, James Mitchell, 48, of Mount Vernon, was arraigned Tuesday on robbery and weapon charges in Greenburgh Town Court. His lawyer refused to comment.

Police Capt. Joseph DeCarlo said it “really is an odd case, but it is a robbery.”

“For me, this is unique, where the robber doesn't want all your money,” he said.

The confrontation began over an artificial rose that the 18-year-old victim had just bought, police said.

“He came out of the store and was approached by the suspect, who said, ‘Give me the rose,”' DeCarlo said. “The kid told him, `Go in there and get one.' But the suspect says, ‘I want that one, and your money, too,' and pulls out a knife. All the kid has is a 10, and the perp says, ‘I only want $4.' He tells the kid to go into the pizza parlor and get change. Then the kid comes out, he takes his $4 and he leaves.”