.SILENT: default

default:
	echo "make <problem # or 'all'>"

all: 1 3 4 5

1 prob1:
	gcc -o prob1 prob1.c

3 prob3:
	gcc -o prob3 prob3.c

4 prob4:
	gcc -O -o prob4 prob4.c

5 prob5:
	gcc -o prob5 prob5.c

clean:
	rm -f prob1 prob3 prob4 prob5 *.o