def middle(a,b,c): if a!=min(min(a,b),c) and a!=max(max(a,b),c): return (a) elif b!=min(min(a,b),c) and b!=max(max(a,b),c): return (b) elif c!=min(min(a,b),c) and c!=max(max(a,b),c): return (c)
a = int(input()) b = int(input()) c = int(input()) print(middle(a,b,c))
if a!=min(min(a,b),c) and a!=max(max(a,b),c):
return (a)
elif b!=min(min(a,b),c) and b!=max(max(a,b),c):
return (b)
elif c!=min(min(a,b),c) and c!=max(max(a,b),c):
return (c)
a = int(input())
b = int(input())
c = int(input())
print(middle(a,b,c))