num = int( input() ) 
w=num // 10000
q=num // 1000 % 10
b=num // 100 % 10
s=num // 10 % 10
g=num % 10
print(w+q+b+s+g)

/**************************************************************
	Problem: 1418
	User: admin
	Language: Python
	Result: Accepted
	Time:160 ms
	Memory:34244 kb
****************************************************************/