/*
Problem Source: http://a...content-available-to-author-only...l.org/problems/556a283cf661160300813812
Problem Name : Welcome to CSE, DU
Name : Adyel Ullahil Mamun
Year : 2016
Email : adyel@live.com
*/
#include <iostream>
using std::cout;
using std::cin;
int main()
{
int a, b, c;
cin >> a >> b >> c;
if(c<=a && c<=b)
{
a-=c;
b-=c;
cout << a + b + c << std::endl;
}
return 0;
}
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