Language: C

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.ConnectException;
import java.rmi.dgc.Lease;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.Set;
import java.util.Stack;
import java.util.TreeMap;
import java.util.TreeSet;

import static java.util.Comparator.*;

public class Main {
	public static void main(String[] args) {
		Main main = new Main();
		main.solve();
		main.out.close();
	}

	// ======================================================================
	public void solve() {
		int N = ni();
		long ans = 0;
		for (int i = 1; i <= N; i++) {
			if(i % 3 == 0 || i % 5 == 0)  continue;
			ans += i;
		}
		out.println(ans);
	}

	// ------------------------------------------
	// ライブラリ
	// ------------------------------------------
	// Print
	private PrintWriter out = new PrintWriter(System.out);

	// Scanner
	private FastScanner scan = new FastScanner();

	int ni() {
		return scan.nextInt();
	}

	int[] ni(int n) {
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = ni();
		}
		return a;
	}

	int[][] ni(int y, int x) {
		int[][] a = new int[y][x];
		for (int i = 0; i < y; i++) {
			for (int j = 0; j < x; j++) {
				a[i][j] = ni();
			}
		}
		return a;
	}

	long nl() {
		return scan.nextLong();
	}

	long[] nl(int n) {
		long[] a = new long[n];
		for (int i = 0; i < n; i++) {
			a[i] = nl();
		}
		return a;
	}

	long[][] nl(int y, int x) {
		long[][] a = new long[y][x];
		for (int i = 0; i < y; i++) {
			for (int j = 0; j < x; j++) {
				a[i][j] = nl();
			}
		}
		return a;
	}

	String ns() {
		return scan.next();
	}

	String[] ns(int n) {
		String[] a = new String[n];
		for (int i = 0; i < n; i++) {
			a[i] = ns();
		}
		return a;
	}

	String[][] ns(int y, int x) {
		String[][] a = new String[y][x];
		for (int i = 0; i < y; i++) {
			for (int j = 0; j < x; j++) {
				a[i][j] = ns();
			}
		}
		return a;
	}
}

class FastScanner {
	private final InputStream in = System.in;
	private final byte[] buffer = new byte[1024];
	private int ptr = 0;
	private int buflen = 0;

	private boolean hasNextByte() {
		if (ptr < buflen) {
			return true;
		} else {
			ptr = 0;
			try {
				buflen = in.read(buffer);
			} catch (IOException e) {
				e.printStackTrace();
			}
			if (buflen <= 0) {
				return false;
			}
		}
		return true;
	}

	private int readByte() {
		if (hasNextByte())
			return buffer[ptr++];
		else
			return -1;
	}

	private static boolean isPrintableChar(int c) {
		return 33 <= c && c <= 126;
	}

	public boolean hasNext() {
		while (hasNextByte() && !isPrintableChar(buffer[ptr]))
			ptr++;
		return hasNextByte();
	}

	public String next() {
		if (!hasNext())
			throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int b = readByte();
		while (isPrintableChar(b)) {
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}

	public long nextLong() {
		if (!hasNext())
			throw new NoSuchElementException();
		long n = 0;
		boolean minus = false;
		int b = readByte();
		if (b == '-') {
			minus = true;
			b = readByte();
		}
		if (b < '0' || '9' < b) {
			throw new NumberFormatException();
		}
		while (true) {
			if ('0' <= b && b <= '9') {
				n *= 10;
				n += b - '0';
			} else if (b == -1 || !isPrintableChar(b)) {
				return minus ? -n : n;
			} else {
				throw new NumberFormatException();
			}
			b = readByte();
		}
	}

	public int nextInt() {
		long nl = nextLong();
		if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
			throw new NumberFormatException();
		return (int) nl;
	}

	public double nextDouble() {
		return Double.parseDouble(next());
	}
}


Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.io.IOException;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.io.IOException;
      |            ^
main.c:2:1: error: unknown type name 'import'
    2 | import java.io.InputStream;
      | ^~~~~~
main.c:2:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | import java.io.InputStream;
      |            ^
main.c:3:1: error: unknown type name 'import'
    3 | import java.io.PrintWriter;
      | ^~~~~~
main.c:3:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    3 | import java.io.PrintWriter;
      |            ^
main.c:4:1: error: unknown type name 'import'
    4 | import java.net.ConnectException;
      | ^~~~~~
main.c:4:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    4 | import java.net.ConnectException;
      |            ^
main.c:5:1: error: unknown type name 'import'
    5 | import java.rmi.dgc.Lease;
      | ^~~~~~
main.c:5:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    5 | import java.rmi.dgc.Lease;
      |            ^
main.c:6:1: error: unknown type name 'import'
    6 | import java.util.ArrayDeque;
      | ^~~~~~
main.c:6:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    6 | import java.util.ArrayDeque;
      |            ^
main.c:7:1: error: unknown type name 'import'
    7 | import java.util.ArrayList;
      | ^~~~~~
main.c:7:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    7 | import java.util.ArrayList;
      |            ^
main.c:8:1: error: unknown type name 'import'
    8 | import java.util.Arrays;
      | ^~~~~~
main.c:8:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    8 | import java.util.Arrays;
      |            ^
main.c:9:1: error: unknown type name 'import'
    9 | import java.util.Collections;
      | ^~~~~~
main.c:9:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    9 | import java.util.Collections;
      |            ^
main.c:10:1: error: unknown type name 'import'
   10 | import java.util.Deque;
      | ^~~~~~
main.c:10:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   10 | import java.util.Deque;
      |            ^
main.c:11:1: error: unknown type name 'import'
   11 | import java.util.HashMap;
      | ^~~~~~
main.c:11:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   11 | import java.util.HashMap;
      |            ^
main.c:12:1: error: unknown type name 'import'
   12 | import java.util.HashSet;
      | ^~~~~~
main.c:12:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   12 | import java.util.HashSet;
      |            ^
main.c:13:1: error: unknown type name 'import'
   13 | import java.util.List;
      | ^~~~~~
main.c:13:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   13 | import java.util.List;
      |            ^
main.c:14:1: error: unknown type name 'import'
   14 | import java.util.Map;
      | ^~~~~~
main.c:14:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   14 | import java.util.Map;
      |            ^
main.c:15:1: error: unknown type name 'import'
   15 | import java.util.NoSuchElementException;
      | ^~~~~~
main.c:15:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   15 | import java.util.NoSuchElementException;
      |            ^
main.c:16:1: error: unknown type name 'import'
   16 | import java.util.Objects;
      | ^~~~~~
main.c:16:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   16 | import java.util.Objects;
      |            ^
main.c:17:1: error: unknown type name 'import'
   17 | import java.util.Set;
      | ^~~~~~
main.c:17:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   17 | import java.util.Set;
      |            ^
main.c:18:1: error: unknown type name 'import'
   18 | import java.util.Stack;
      | ^~~~~~
main.c:18:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   18 | import java.util.Stack;
      |            ^
main.c:19:1: error: unknown type name 'import'
   19 | import java.util.TreeMap;
      | ^~~~~~
main.c:19:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   19 | import java.util.TreeMap;
      |            ^
main.c:20:1: error: unknown type name 'import'
   20 | import java.util.TreeSet;
      | ^~~~~~
main.c:20:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   20 | import java.util.TreeSet;
      |            ^
main.c:22:7: error: expected ';' before 'static'
   22 | import static java.util.Comparator.*;
      |       ^~~~~~~
      |       ;
main.c:22:19: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
   22 | import static java.util.Comparator.*;
      |                   ^
main.c:24:1: error: unknown type name 'public'
   24 | public class Main {
      | ^~~~~~
main.c:24:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Main'
   24 | public class Main {
      |              ^~~~
main.c:118:1: error: unknown type name 'class'
  118 | class FastScanner {
      | ^~~~~
main.c:118:19: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
  118 | class FastScanner {
      |                   ^