import std.stdio;
import std.conv;
import std.string;
import std.typecons;
import std.algorithm;
import std.array;
import std.range;
import std.math;
import std.container;
import std.datetime;

void main()
{
	while (1) {
		auto x = readln.chomp.split.map!(to!int).array;
		if (x[0] == 0) break;
		x[1]--;
		int winner, sum;
		foreach (i; 0..x[0]) {
			auto a = readln.chomp.to!int;
			if (i == x[1]) winner = a;
			sum += a;
		}
		if (!winner) writeln(0);
		else {
			writeln(sum * (100-x[2]) / winner);
		}
	}
}