Calculate Registration Fees

You are tasked with calculating the total registration fees collected from participants in three races. The registration fee for the 5km race is $10, for the 10km race is $20, and for the 21km race is $30. Use the formula: (total_fees = a \times 10 + b \times 20 + c \times 30), where (a), (b), and (c) denote the number of participants in the 5km, 10km, and 21km races respectively.

inputFormat

The input is provided via standard input (stdin) as a single line containing three space-separated integers: a, b, and c, representing the number of participants in the 5km, 10km, and 21km races respectively.

outputFormat

Output a single integer to standard output (stdout) representing the total registration fees collected.## sample

10 5 2

260