Logic Building
# Take n as input
n = int(input("Enter n: "))
# Count divisible by 3
count = 0
for i in range(1, n + 1):
if i % 3 == 0:
count += 1
print(f"Numbers divisible by 3: {count}")Output
Enter n: 20 Numbers divisible by 3: 6
Check each number for divisibility by 3.
Key Concepts:
- Loop from 1 to n
- Check if divisible by 3 using modulo
- Count matches