#include<stdio.h>
int main(void){
	int N, M, P, X[100] = {};
	int i,sum;

	while (1){
		scanf("%d %d %d",&N,&M,&P);
		if (N == 0 && M == 0 && P == 0){
			break;
		}
		for (i = 0; i < N; i++){
			scanf("%d", &X[i]);
		}

		for (i = 0; i < N; i++){
			sum = sum + X[i];
		}

		printf("%d\n", sum*(P / 100) / M);
	}
	return 0;
}