View Compilation Error

0_0_17856765_9533.cpp:8:1: error: expected ',' or ';' before 'int'
 int n,dp[2][505][505];
 ^
0_0_17856765_9533.cpp: In function 'int main()':
0_0_17856765_9533.cpp:23:21: error: 'n' was not declared in this scope
         scanf("%d",&n);
                     ^
0_0_17856765_9533.cpp:27:16: error: 'dp' was not declared in this scope
         memset(dp[p],0,sizeof(dp[p]));
                ^