20250523

# a = []
#
# def f(x):
#     global a
#     b=0
#     c=0
#     if x=='+' :
#         b=a.pop()
#         c=a.pop()
#         a.append(b+c)
#     elif x=='-' :
#         b=a.pop()
#         c=a.pop()
#         a.append(c-b)
#     elif x=='*' :
#         b=a.pop()
#         c=a.pop()
#         a.append(b*c)
#     else :
#         x=int(x)
#         a.append(x)
#
#
# data=list(input().split())
# for i in range(len(data)) :
#     f(data[i])
#
# print(a[0])

a=[]

def f(x) :
    global a
    

m=0
data=list(input())
for i in range(len(data)) :
    m+=f(data[i])