#include <iostream>
#include <cmath>
using namespace std;
 
int main() {
	unsigned char b[] = { 4, 0x00, 0x00, 0x00, 0x1B, 0xE4 };
	unsigned int n = b[0];
	unsigned int SI = (b[1] & 0x80) >> 7;
	unsigned int SE = (b[1] & 0x40) >> 6;
	unsigned int exponent = b[1] & 0x3f;
	unsigned int integer = 0;
	for (int i = 0; i < n; ++i)
	    integer = (integer << 8) + b[2+i];
	double d = pow(-1, SI) * integer * pow(10, pow(-1, SE) * exponent);
	cout << d << endl;
	return 0;
}

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