import math
speedofLight = 2.9979*pow(10,8)
electronConstant = 1.602 * pow(10, -19)
planck = 6.626 * pow(10,-34)
massOfElectron = 9.1093837 * pow(10,-31)

def closestWork():
    wavelength = float(input('Input Wavelength: '))
    
    phi = 1240/wavelength
    
    print(phi)
    
closestWork()
import math
speedofLight = 2.9979*pow(10,8)
electronConstant = 1.602 * pow(10, -19)
planck = 6.626 * pow(10,-34)
massOfElectron = 9.1093837 * pow(10,-31)

def closestWork():
    wavelength = float(input('Input Wavelength: '))
    
    phi = 1240/wavelength
    
    print(phi)
    
closestWork()