PLEASE HELP ME WITH IF AND ELIF STATEMENTS :     # Kinematics clculator

    print('Kinematics Calculator')

    print('If either one of the three values(s,v,t) is not given then put its value = 1')


    s = float(input('Enter your distance =  '))
    print(s)


    t = float(input('Enter your time =  '))
    print(t)


    v = float(input('Enter your velocity =  '))
    print(v)


    if 'v == 1' :
    print('velocity = '+ str(s/t))

    elif 't == 1' :
        print('time = '+ str(s/v))
                                
    else :
         's == 1' 
    print('distance = '+ str(v*t)) 


        
Help me correct this code. 
whenever i try to calculate anything else than "velocity"
it always uses the first print command i.e
    
    print('velocity = '+ str(s/t)) 