PIG how to count a number of rows in alias

I did something like this to count the number of rows in an alias in PIG:

logs = LOAD 'log'logs_w_one = foreach logs generate 1 as one;logs_group = group logs_w_one all;logs_count = foreach logs_group generate SUM(logs_w_one.one);dump logs_count;

This seems to be too inefficient. Please enlighten me if there is a better way!