a=gets.split.map{|e| e.to_i}.sort
ans=a[0]
a[2]=a[2]-a[0]
a[1]=a[1]-a[0]
b=(a[2]-a[1])/2
if a[1]<=b then
ans=ans+a[1]
a[2]=a[2]-a[1]*3
ans=ans+a[2]/5
else
a[2]=a[2]-b*2-b
ans=ans+b
a[1]=a[1]-b
#puts "a" ,ans,a[1],a[2],"b"
if a[2]==a[1]+1 then
ans=ans+(a[2]-1)/2
else
if a[1]%2==1 then
ans=ans+a[1]/2
else
ans=ans+((a[1]/2)/2)*2
end
end
end
puts ans
CmE9Z2V0cy5zcGxpdC5tYXB7fGV8IGUudG9faX0uc29ydAphbnM9YVswXQphWzJdPWFbMl0tYVswXQphWzFdPWFbMV0tYVswXQoKYj0oYVsyXS1hWzFdKS8yCmlmIGFbMV08PWIgdGhlbgoJYW5zPWFucythWzFdCglhWzJdPWFbMl0tYVsxXSozCglhbnM9YW5zK2FbMl0vNQplbHNlCglhWzJdPWFbMl0tYioyLWIKCWFucz1hbnMrYgoJYVsxXT1hWzFdLWIKCSNwdXRzICJhIiAsYW5zLGFbMV0sYVsyXSwiYiIKCWlmIGFbMl09PWFbMV0rMSB0aGVuCgkJYW5zPWFucysoYVsyXS0xKS8yCgllbHNlCgkJaWYgYVsxXSUyPT0xIHRoZW4KCQkJYW5zPWFucythWzFdLzIKCQllbHNlCgkJCWFucz1hbnMrKChhWzFdLzIpLzIpKjIKCQllbmQKCWVuZAplbmQKcHV0cyBhbnM=