0_0_20826994_29613.cpp: In function 'int main()':
0_0_20826994_29613.cpp:16:2: error: 'cin' was not declared in this scope
cin >> n;
^
0_0_20826994_29613.cpp:21:3: error: 'cout' was not declared in this scope
cout << md(a,b,c) << endl;
^
0_0_20826994_29613.cpp:21:24: error: 'endl' was not declared in this scope
cout << md(a,b,c) << endl;
^
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