import sys
import numpy
#print('Arguments are: ', sys.argv)

#answer = float(sys.argv[1]) * float(sys.argv[2])

#print("Answer is ", answer)

#action = sys.argv[1]
#filenames = sys.argv[2:]

#for filename in filenames:
#    data = numpy.loadtxt(filename, delimiter=',')
#    if action == '--mean':
#        print(numpy.mean(data))
#    elif action == '--min':
#        print(numpy.min(data))
#    elif action == '--printname':
#        print(filename)
#    else:
#        print("Command not recognised")

#I'm going to read the arguments
#x = sys.argv[1]

#I'm going to print a message
#print(......)

# x + y - z
x = float(sys.argv[1])
y = float(sys.argv[2])
z = float(sys.argv[3])

print(x + y - z)