#include <stdio.h>
int main(void)
{
int a, b, c, count, temp;
scanf("%d,%d,%d",&a
,&b
,&c
); count=0;
if(a>b)
{
temp=a;
a=b;
b=temp;
}
for(a;a<=b;a++)
{
if(c%a==0)
{
count++;
}
}
return 0;
}
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