diff --git a/du1/program b/du1/program
new file mode 100755
index 0000000..c644fbf
Binary files /dev/null and b/du1/program differ
diff --git a/du2/program b/du2/program
new file mode 100755
index 0000000..7797976
Binary files /dev/null and b/du2/program differ
diff --git a/du3/program b/du3/program
new file mode 100755
index 0000000..4d2425e
Binary files /dev/null and b/du3/program differ