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#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>

double lev_sums[1002];
signed main() {
	double res = 0;
	char c;
	int xx = 0;
	while ((c = getc(stdin)) != EOF) {
		if (c == '(')
			xx++;
		if (c == ')')
			xx--;
		if (isdigit(c)) {
			ungetc(c, stdin);
			int y;
			scanf("%d", &y);
			lev_sums[xx] += y;
		}
	}
	long double z = 1;
	for (int i = 0; i < 1001; ++i) {
		res += lev_sums[i] / z;
		z *= 2;
	}
	printf("%.2lf", res);
}