python百鸡百钱

百鸡百钱问题：公鸡每只5元，母鸡每只3元，小鸡3只一元，现要求用100元钱买100只鸡，问公鸡、母鸡、小鸡各买几只？
公鸡：x   母鸡:y  小鸡: z

5x+3y+z/3=100
x+y+z=100

for x in range(0,100):
       for y in range(0,100):
               z=100-x-y
               if z>=0 and 5*x+3*y+z/3==100:
                       print("公鸡%d只、母鸡%d只、小鸡%d只"%(x,y,z))