Zero. e raised to negative infinity is 1/e raised to infinity. That's 1/infinity which is zero.
In the Third Great Beast Arc, Lee's condition worsens, and Tsunade becomes concerned about him injuring himself again. She removes him from missions, but allows him to keep training after he convinces her to do so. Around this time, Guy arrives with a new student, who easily defeats Lee and injures his ankle.
At a young age, Rock Lee has demonstrated the ability to open the first six gates and an incomplete seventh gate. Lee has also been shown to be able to release the limiters on his eyebrows.
When Tsunade, a Konohagakure medical ninja, returns to lead the village as the Fifth Hokage, she offers to operate on him. Despite the procedure's fifty percent chance of failure, Guy encourages Lee to have the operation. Ultimately, Lee undergoes the surgery, which succeeds in healing his arm and leg.