def find_port(ports, target):
    """
    Returns the first integer in ports that equals the target or is greater.
    If there is no solution, returns -1.
 
    Args:
        ports (list): A list of port numbers.
        target (int): The target port number.
 
    Returns:
        int: The first port number greater than or equal to the target, or -1 if not found.
    """
    # Iterate over the ports and return the first one that's greater than or equal to the target
    for port in ports:
        if port >= target:
            return port
 
    # If no port is greater than or equal to the target, return -1
    return -1
 
# Example usage:
ports = [80, 22, 443, 21]
target = 25
print(find_port(ports, target))  # Output: 80

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