#include <stdio.h>
int main(void) {
int a,b,c,i,sum;
sum=0;
scanf("%d,%d,%d",&a
,&b
,&c
); if(a<b){
for(i=a;i<=b;i++){
if(c%i==0){
sum=sum+1;
}
}
}
else{
for(i=b;i<=a;i++){
if(c%i==0){
sum=sum+1;
}
}
}
return 0;
}
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