Johnny works with one hammer

Johnny works with one hammer, one hammer, one hammer 

Johnny works with one hammer, then he works with two 

Johnny works with two hammers, two hammers, two hammers

Johnny works with two hammers, then he works with three 

Johnny works with three hammers, three hammers, three hammers 

Johnny works with three hammers, then he works with four 

Johnny works with four hammers, four hammers, four hammers 

Johnny works with four hammers, then he works with five 

Johnny works with five hammers, five hammers, five hammers 

Johnny works with five hammers, then he goes to sleep!