Find number abc

A farmer is sitting in the neighborhood bar getting soused. A man comes in and asks the farmer, "Hey, why are you sitting here on this beautiful day getting drunk?"

Farmer: Some things you just can't explain.
Man: So what happened that's so horrible?
Farmer: Well, today I was sitting by my cow milking her. Just as I got the bucket about full, she took her left leg and kicked over the bucket.
Man: Ok, but that's not so bad.
Farmer: Some things you just can't explain.
Man: So what happened then?
Farmer: I took her left leg and tied it to the post on the left.
Man: and then?
Farmer: Well, I sat back down and continued to milk her. Just as I got the bucket about full, she took her right leg and kicked over the bucket.
Man: Again?
Farmer: Some things you just can't explain.
Man: So, what did you do then?
Farmer: I took her right leg this time and tied it to the post on the right.
Man: and then?
Farmer: Well, I sat back down and began milking her again. Just as got the bucket about full, the stupid cow knocked over the bucket with her tail.
Man: Hmmm
Farmer: Some things you just can't explain.
Man: So, what did you do?
Farmer: Well, I didn't have any more rope, so I took off my belt and tied her tail to the rafter. In that moment, my pants fell down and my wife walked in...