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import random
import sys
def expr(depth):
if depth==1 or random.random()<1.0/(2**depth-1):
return str(int(random.random() * 100) + 1)+".0"
return '(' + expr(depth-1) + random.choice(['+','-','*','/']) + expr(depth-1) + ')'
print expr( int(sys.argv[1]) )
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