Fitness Exercises

Recently, Chef has noticed that he is becoming fatter than ever. It is not surprising, as Chef is eating a lot of the food he is cooking. Therefore, he has been doing exercises for the last $N$ days (numbered $1$ through $N$). For some of these days, Chef remembers for how many minutes he exercised. You are given a sequence $A_1, A_2, \ldots, A_N$. For each valid $i$, if $A_i \ge 0$, then Chef exe