Keith has p pennies, n nickels, and d dimes in his pocket. The total number of coins is 9. The expression $\displaystyle{0.01}{p}+{0.05}{n}+{0.10}{d}\usepackage{cmbright}\Huge\$ represents the value of the coins, which is equal to $0.44. He has one more dime than nickels. How many pennies does Keith have?

Keith has _____ pennies.