###luna2
luna2_mass = 390.2
luna2_launch_date = '12 september 1959'
###luna4
luna4_mass = 1422.0
luna4_launch_date= '2 April 1963'
mass_diff = luna2_mass - luna4_mass
print("luna2 ważący", luna2_mass, "kg, został wystrzelony", luna2_launch_date)
print("luna4 ważący", luna4_mass, "kg, został wystrzelony", luna4_launch_date)
print("Różnica masy startowej pomiędzy misjami wyniosła", mass_diff, "kg")
mass_diff = mass_diff + 5
print("Różnica masy startowej pomiędzy misjami wyniosła", mass_diff, "kg")
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