s=input()
dic={'B':2,'D':10,'H':16} 
st=['']*100
top=-1
i=x=m=0
while i<len(s): 
    if s[i]=='+' or s[i]=='=': 
        __________      
        __________ 
        t=0 
        while top!=-1:
            if st[top]>='A' and st[top]<='F': 
                st[top]=ord(st[top])-ord('A')+10 
            x=__________
            t=t+1 
            top=top-1 
    else: 
        __________
        __________ 
    i=i+1
print(x)