C :

#include<stdio.h>

void main(){
	int n,i,g,s,b,c;
	scanf("%d",&n);
	
	c=0;
	for(i=1;i<=n;i++){
		g=i%10;
		s=i/10%10;
		b=i/100;
		if(i%7!=0&&(g!=7&&s!=7&&b!=7)){
			c=c+i;
		}
	} 
		printf("%d",c);
}

C++ :

#include <iostream>
using namespace std;

int main(){
	int i,n,g,s,b,x = 0;
	cin>>n;
	for(i = 1;i <= n;i++){
		b = i / 100;
		s = i / 10 % 10;
		g = i % 10;
		
		if(i % 7 != 0 && (b != 7 && s != 7 && g != 7)){
			x = x + i;
		}
	}
	cout<<x<<endl;
}

Python :

n=int(input())
i=1
s=0
for i in range(1,n+1):
    a=i//100
    b=i//10%10
    c=i%10
    if i%7==0 or a==7 or b==7 or c==7:
        continue
    if i%7!=0 and a!=7 and b!=7 and c!=7:
        s+=i
        i+=1
print(s)