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View Compilation Error

0_0_31313830_3652.cpp: In function 'int main()':
0_0_31313830_3652.cpp:5:14: error: 'N' was not declared in this scope
  scanf("%d",&N);
              ^
0_0_31313830_3652.cpp:20:3: error: 's' was not declared in this scope
   s=pow(3,n)-24;
   ^
0_0_31313830_3652.cpp:20:12: error: 'pow' was not declared in this scope
   s=pow(3,n)-24;
            ^
0_0_31313830_3652.cpp:21:15: error: 's' was not declared in this scope
   printf("%d",s);
               ^


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