N=int(input())
mod=10**9+7

def S1(x): # 1 2 4 5 7 8 10 11 13 14
    ANS=(1+x)*x//2
    t=x//3

    return ANS-(1+t)*t//2*3

def S2(x): # 1 3 4 6 7 9 10 12 13 15
    ANS=(1+x)*x//2
    t=x//3

    return ANS-(1+t)*t//2*3+t

def S3(x): # 0 2 3 5 6 8 9 10 11 13 14
    ANS=(1+x)*x//2
    t=(x+1)//3

    return ANS-(1+t)*t//2*3+t+t


x=(N-2)//2
if N%3==0:
    print(S3(x)%mod)
elif N%3==1:
    print(S1(x)%mod)
else:
    print(S2(x)%mod)