Envío 592

Código

N =  int(input())
A = [eval(num) for num in input().split()]
sum_accum = [0] * N
sum_accum[-1] = A[-1]
for i in range(-2, -N-1, -1):
    sum_accum[i] = A[i] + sum_accum[i+1]
for idx, num in enumerate(sum_accum):
        if num < 0 and not idx:
            print("Impossible")
            break
        if num < 0:
            print(idx)
            break
else:
    print("Impossible")