#include <iostream>
#include <map>
using namespace std;

int main() {
	std::map<double,double> dmap;
	dmap[0.2] = 6.0;
	double d = 1.2;
	double d2 = 1.0;
	double d3 = d - d2;
	dmap[d3] = 5.0;
	printf("%f", dmap[0.2]);
	return 0;
}