import fractions  
import math  
  
print('PI       =', math.pi)  
  
f_pi = fractions.Fraction(str(math.pi))  
print('No limit =', f_pi)  
  
for d in [1, 5,  50, 90, 100, 500, 1000000]:  
    limited = f_pi.limit_denominator(d)  
    print('{0:8} = {1}'.format(d, limited))