,,,, 12 bytes
↻5×↻4×↻3×↻-#
Explanation
Take input 4, 3, 2, 1 for example.
↻5×↻4×↻3×↻-#
implicit input [4, 3, 2, 1]
↻ rotate the stack clockwise [1, 4, 3, 2]
5 push 5 [1, 4, 3, 2, 5]
× pop 2 and 5 and push 2 * 5 [1, 4, 3, 10]
↻ rotate the stack clockwise [10, 1, 4, 3]
4 push 4 [10, 1, 4, 3, 4]
× pop 3 and 4 and push 3 * 4 [10, 1, 4, 12]
↻ rotate the stack clockwise [12, 10, 1, 4]
3 push 3 [12, 10, 1, 4, 3]
× pop 4 and 3 and push 4 * 3 [12, 10, 1, 12]
↻ rotate the stack clockwise [12, 12, 10, 1]
- pop 10 and 41 and push 10 - 41 [12, 12, 9]
# pop 12, 12, 9 and push the sum [33]
implicit output