<s> class Solution : <EOL> def climbStairs ( self , n ) : <EOL> prev , current = <NUM_LIT:0> , <NUM_LIT:1> <EOL> for i in xrange ( n ) : <EOL> prev , current = current , prev + current , <EOL> return current <EOL> if __name__ == "<STR_LIT:__main__>" : <EOL> result = Solution ( ) . climbStairs ( <NUM_LIT:2> ) <EOL> print result </s>
