View Compilation Error

0_0_29106958_5056.cpp:20:16: error: invalid type argument of unary '*' (have 'int')
 const int M=5**N;
                ^
0_0_29106958_5056.cpp:26:8: error: size of array 'edge' is not an integral constant-expression
 }edge[M],edge2[M];
        ^
0_0_29106958_5056.cpp:26:17: error: size of array 'edge2' is not an integral constant-expression
 }edge[M],edge2[M];
                 ^