Armstrong Number

#include<stdio.h>
#include<math.h>

int countdigit(int num){
    int count=0;
    while(num>0){
        num=num/10;
        count++;
    }
    return count;
}

int isarmstrong(int num){
    int original=num;
    int digit=(countdigit(num));
    int sum=0;

    while(num>0){
        int remainder = num%10;
        sum= sum+pow(remainder,digit);
        num=num/10;
    }

    return (sum==original);
}

int ntharmstrong(int n){
    int count =0;
    int num=0;

    while(count<n){
        num++;
        if(isarmstrong(num)){
            count++;
        }
     }

     return num;
}

int main(){
    int n;
    scanf("%d", &n);
    int finale=ntharmstrong(n);

    printf("%dth armstrong number is %d", n, finale);
}