def find_greatest(a, b, c):
greatest = max(a, b, c):
    return greatest

# Example usage:
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
num3 = float(input("Enter third number: "))
result = find_greatest(num1, num2, num3)
print(f"The greatest number among {num1}, {num2}, and {num3} is: {result}")