- #include <iostream> 
- using namespace std; 
-   
- int main()  
- { 
-     int n, a, b, c, x, y, z; 
-     cin >> n >> a >> b >> c >> x >> y >> z; 
-     if (x + y + z == 0) { 
-         cout << 0; 
-     } 
-     else { 
-         cout << (x + y + z) - (a + b + c - n); 
-     } 
-     return 0; 
- } 
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