Main.cc: In function 'int main()': Main.cc:15:5: error: expected ';' before 'for' for(int i=2;i<=N;i++){ ^ Main.cc:15:17: error: 'i' was not declared in this scope for(int i=2;i<=N;i++){ ^ Main.cc:20:1: error: expected '}' at end of input } ^