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program Snow_Clearing;
var ppp,pp,h,m:longint;
x1,y1,x2,y2,ans:extended;
begin
assign(input,'snow.in');
assign(output,'snow.out');
reset(input);
rewrite(output);
read(x1, y1);
ans:=0;
while not eof do
begin
readln(x1,y1,x2,y2);
ans:=ans+sqrt(sqr(x1-x2)+sqr(y1-y2));
end;
ans:=ans*2/1000/20;
h:=trunc(ans); m:=round(60*(ans-h));
if m=60 then begin m:=0; inc(h) end;
write(h,':');
if m<10 then write(0);
writeln(m);
close(output);
close(input);
end.