C :

#include<stdio.h>

void main(){
	int x,m,n,p=0,g,s,b,q,i;
	scanf("%d\n",&x);
	scanf("%d",&m);
	scanf("%d",&n);
	
	for(i=m;i<=n;i++){
		g=i%10;
		s=i/10%10;
		b=i/100%10;
		q=i/1000;
		if(g==x||s==x||b==x||q==x){
			p++;
		} 
	}
	printf("%d",p); 
		
}

C++ :

#include <iostream>
using namespace std;

int main(){
	int x,g,s,b,q,i,c = 0,m,n;
	cin>>x;
	cin>>m>>n;
	for(i = m;i <= n;i++){
		g = i % 10;
		s = i / 10 % 10;
		b = i / 100 % 10;
		q = i / 1000;
		if(g == x || s == x || b == x || q == x){
			c++;
		}
	}
	cout<<c<<endl;
	
}

Python :

x = int(input())
y = input().split()
m = int(y[0])
n = int(y[1])
c = 0
for i in range(m, n + 1):
    q = i // 1000 % 10
    b = i // 100 % 10
    s = i // 10 % 10
    g = i // 1 % 10
    if q == x or b == x or s == x or g == x:
        c += 1
print(c)