I would say five hundred or maybe even a thousand. I would strategically place my self upon one of those big water slide that has a ladder on the side so I can fight them one after the other. I bring with me a paintball gun with ample amount of ammunition, a whiffle bat and a large Bluetooth speaker. As the countdown begins I would see the children crawling over each other trying to get out of the elementary school. The clock hits 30 seconds till the doors open, I pull out the picture of the one girl who got away I put on a kickass playlist, shotgun a beer of two and the doors swing open as the army of children run full speed towards the slide, I lock and load the paintball gun and await the incoming horde. As they start climbing one by one I start unloading on them aiming specifically for areas of pain. As the horde continues their advance I stand my ground picking them off one by one as they cry and whine all the way down the slide as they trip over their weeping comrades trying to get to the top as the battle wages on i begin to run out of ammo, as they keep coming I run out and eventually throw the weapon at them to slow them down as I draw my whiffle bat I frantically swing and bash them and throw them around. By this time there's a solid number of third graders unconscious for their friends to climb their bodies like a hill. I swing and swear and use all my might but they keep coming and won't stop coming. I am exhausted both physically and mentally I know there is no way out. make my peace with God as there is no way out, I am surrounded, I throw my whiffle bat as hard as I can and throw a roundhouse kick to tommy right in the chest that send the pack tumbling down which buys me a minute. I go to my playlist and select sweet emotion by Aerosmith as I take a few steps back I run and jump just in time for the chorus begin. As I fly through the air coming down I can see the little bastards smiling and grabbing in the air, as I begin my decent I start swinging to hopefully take some with me as I land I know I crush a few of the kids below which gives me a sense of happiness as the horde begins to attack me and tear me to shreds.

Moral of the story: if you don't flat out murder them they will win every time