In [14]:

    

def compute_sum(end):
    i=0
    total_n=1
    
    while i<end:
        i=i+1
        total_n=total_n*i
        
    return total_n

n=int(input('plz enter an integer,end with a tab: '))
m=int(input('plz enter an integer,end with a tab: '))
k=int(input('plz enter an integer,end with a tab: '))
    
print(compute_sum(m)+compute_sum(n)+compute_sum(k))


    

    




plz enter an integer,end with a tab: 3
plz enter an integer,end with a tab: 2
plz enter an integer,end with a tab: 1
9