diff --git a/rpm.c b/rpm.c
new file mode 100644
index 0000000..5afe8b5
--- /dev/null
+++ b/rpm.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+int RPM( int a, int b )
+{
+    int sum = 0;
+
+    while( b )
+    {
+        if( b & 1 )
+            sum += a;
+
+        a <<= 1;
+        b >>= 1;
+    }
+
+    return sum;
+}
+
+int main()
+{
+    return printf( "%d\n", RPM( 86, 57 ) );
+}
+