{"trustable":true,"sections":[{"title":"","value":{"format":"HTML","content":"Your task is to write a program, which, given two circles, calculates the area of their intersection with the accuracy of three digits after decimal point."}},{"title":"Input","value":{"format":"HTML","content":"In the single line of input file there are space-separated real numbers x1 y1 r1 x2 y2 r2. They represent center coordinates and radii of two circles."}},{"title":"Output","value":{"format":"HTML","content":"The output file must contain single real number - the area."}},{"title":"Sample","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e20.0 30.0 15.0 40.0 30.0 30.0\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e608.366\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}