#include <stdio.h>
r;f(n){for(r=0;n/=5;)r+=n;return r;}
int main (int argc, char **argv) {
int i;
int testcases[] = {1, 5, 100, 666, 2016};
for (i = 0; i < (sizeof(testcases) / sizeof(testcases[0])); i++) {
printf("f(%d)=%d\n", testcases
[i
], f
(testcases
[i
])); }
return 0;
}
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