a = int(input());b = input().split(' ');jx = 0;xl = 1;zh = 0
for i in range(a):
    if int(b[i]) < 0:
        zh = jx + int(b[i])
        if zh <= 0:
            xl -= zh
    else:
        jx += int(b[i])
print(xl)```
求大佬调整