T,G,PG=5,2,3
n=int(input())
T_num=n//T+1
G_num=n//G+1
PG_num=n//PG+1
cnt=0
for i in range(T_num):
    for j in range(G_num):
        for k in range(PG_num):
            if T*i+G*j+PG*k==n:
                if i>=j:
                    cnt+=1
print(cnt)