How to run special compiled code (MPI)

Hi, I need to run MPI code, so for compiling phase it is ok I run *mpicc -lm -static -DONLINE_JUDGE -DDOMJUDGE -o $DEST "$@" * at my run file. But to run the program, I need to use *mpirun -n 16 ./compiledcode * the 16 is the number of process I have and should be configurable as the -n flag. I didn't find it on Manual. Thank You -- Leandro Negri Zanotto