View Compilation Error

0_0_39701279_5944.cpp: In function 'int main()':
0_0_39701279_5944.cpp:4:19: error: 'N' was not declared in this scope
    4 |     __int64 n,i,f[N]={2};
      |                   ^
0_0_39701279_5944.cpp:7:9: error: 'f' was not declared in this scope
    7 |         f[i]=3*f[i-1]+2;
      |         ^
0_0_39701279_5944.cpp:11:26: error: 'f' was not declared in this scope
   11 |         printf("%I64d\n",f[n-1]);
      |                          ^