Write a C$++$ program for the following task: Two phone numbers and the duration of the call in minutes are read from standard input. Calculate the cost of the call, knowing that the first $30$ minutes cost $3$ dollars$/$min$,$ and after those $30$ minutes, the price per minute is $2$ dollars. Additionally, if both phone numbers are from the same operator, a $30\%$ discount should be applied.Operator$1$ uses $(071,072,073)$Operator$2$ uses $(074,075,076)$