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- #include <stdio.h>
- #include <stdlib.h>
- int main()
- {
- int n, s, p, z, i;
- scanf("%d", &n);
- if (n<0) {
- printf("greska\n");
- return -1;
- } else if (n%2!=0) {
- printf("greska\n");
- return -1;
- }
- p=3;
- s=0;
- z=(-1);
- for(i=5; i<=n; i=i+2) {
- p=p*i;
- z=z*(-1);
- s=s+z*p;
- }
- printf("%d", s);
- return 0;
- }
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