#include<stdio.h>

int main()

{

int a,  q, w, e,z,x,c ,fangfa = 0;

scanf("%d", &a);

z = a / 5;

x = a / 2;

c = a / 1;

for (q = 1; q < z; q++)

{

for (w = 1; w < x; w++)

{

for (e = 1; e < c; e++)

{

if ((5 * q) + (2 * w) + (e * 1) == a)

fangfa++;

else

continue;

}

}

}

printf("%d", fangfa);

return 0;

}