def sushu(n):
    for i in range(2,int(n**0.5)+1):
        if n%i==0 and n!=2:
            return False
    else:
        return True
count=1
j=3
while True:
    if sushu(j):
        count=count+1
        if count==1000:break
    j=j+2
print(j)

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