View Compilation Error

0_0_38644414_11056.cpp: In function 'int main()':
0_0_38644414_11056.cpp:16:11: error: a function-definition is not allowed here before '{' token
 int main(){
           ^
0_0_38644414_11056.cpp:31:1: error: expected '}' at end of input
 }
 ^
0_0_38644414_11056.cpp:10:8: note: to match this '{'
    else{
        ^
0_0_38644414_11056.cpp:31:1: error: expected '}' at end of input
 }
 ^
0_0_38644414_11056.cpp:7:7: note: to match this '{'
   else{
       ^
0_0_38644414_11056.cpp:31:1: error: expected '}' at end of input
 }
 ^
0_0_38644414_11056.cpp:5:18: note: to match this '{'
  while(cin>>M>>N){
                  ^
0_0_38644414_11056.cpp:31:1: error: expected '}' at end of input
 }
 ^
0_0_38644414_11056.cpp:3:11: note: to match this '{'
 int main(){
           ^