#include <stdio.h>
int main(int argc,const char * argv[]){
    int a,b,c,count=0;
    int box[10000];
    int i,n=0;
    scanf("%d %d %d",&a,&b,&c);
    //????????????
    
    for(i=1;i<=c;i++){
        if(c%i==0){
            box[n]=i;
            n = n + 1;
        }
    }
    for(i=a,n=0;i<=b;i++){
        if(i==box[n]){
            count = count+1
        }
    }
    printf("%d\n",count);
}