#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;
}
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