import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.InputMismatchException;
import java.util.List;
import java.util.Map;
import java.util.Set;

class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		OutputWriter out = new OutputWriter(outputStream);
		new Main().solve(in, out);
	}

	void solve(InputReader in, OutputWriter out) {
		int n = in.nextInt();

		int[] a = new int[n];

		for (int i = 0; i < n; i++)
			a[i] = in.nextInt();

		Map<Long, Integer> h = new HashMap<>();

		h.put(0L, 1);

		long pre = 0;
		long ans = 0;
		for (int i = 0; i < n; i++) {
			pre += a[i];

			int count = h.getOrDefault(pre, 0);

			ans += count;

			h.put(pre, h.getOrDefault(pre, 0) + 1);
		}

		System.out.println(ans);
	}

	static class InputReader {
		private boolean finished = false;

		private InputStream stream;
		private byte[] buf = new byte[1024];
		private int curChar;
		private int numChars;
		private SpaceCharFilter filter;

		public InputReader(InputStream stream) {
			this.stream = stream;
		}

		public static boolean isWhitespace(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		public int read() {
			if (numChars == -1) {
				throw new InputMismatchException();
			}
			if (curChar >= numChars) {
				curChar = 0;
				try {
					numChars = stream.read(buf);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (numChars <= 0) {
					return -1;
				}
			}
			return buf[curChar++];
		}

		public int peek() {
			if (numChars == -1) {
				return -1;
			}
			if (curChar >= numChars) {
				curChar = 0;
				try {
					numChars = stream.read(buf);
				} catch (IOException e) {
					return -1;
				}
				if (numChars <= 0) {
					return -1;
				}
			}
			return buf[curChar];
		}

		public int nextInt() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9') {
					throw new InputMismatchException();
				}
				res *= 10;
				res += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public long nextLong() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			long res = 0;
			do {
				if (c < '0' || c > '9') {
					throw new InputMismatchException();
				}
				res *= 10;
				res += c - '0';
				c = read();
			} while (!isSpaceChar(c));
			return res * sgn;
		}

		public String nextString() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			StringBuilder res = new StringBuilder();
			do {
				if (Character.isValidCodePoint(c)) {
					res.appendCodePoint(c);
				}
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		public boolean isSpaceChar(int c) {
			if (filter != null) {
				return filter.isSpaceChar(c);
			}
			return isWhitespace(c);
		}

		private String readLine0() {
			StringBuilder buf = new StringBuilder();
			int c = read();
			while (c != '\n' && c != -1) {
				if (c != '\r') {
					buf.appendCodePoint(c);
				}
				c = read();
			}
			return buf.toString();
		}

		public String readLine() {
			String s = readLine0();
			while (s.trim().length() == 0) {
				s = readLine0();
			}
			return s;
		}

		public String readLine(boolean ignoreEmptyLines) {
			if (ignoreEmptyLines) {
				return readLine();
			} else {
				return readLine0();
			}
		}

		public BigInteger readBigInteger() {
			try {
				return new BigInteger(nextString());
			} catch (NumberFormatException e) {
				throw new InputMismatchException();
			}
		}

		public char nextCharacter() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			return (char) c;
		}

		public double nextDouble() {
			int c = read();
			while (isSpaceChar(c)) {
				c = read();
			}
			int sgn = 1;
			if (c == '-') {
				sgn = -1;
				c = read();
			}
			double res = 0;
			while (!isSpaceChar(c) && c != '.') {
				if (c == 'e' || c == 'E') {
					return res * Math.pow(10, nextInt());
				}
				if (c < '0' || c > '9') {
					throw new InputMismatchException();
				}
				res *= 10;
				res += c - '0';
				c = read();
			}
			if (c == '.') {
				c = read();
				double m = 1;
				while (!isSpaceChar(c)) {
					if (c == 'e' || c == 'E') {
						return res * Math.pow(10, nextInt());
					}
					if (c < '0' || c > '9') {
						throw new InputMismatchException();
					}
					m /= 10;
					res += (c - '0') * m;
					c = read();
				}
			}
			return res * sgn;
		}

		public boolean isExhausted() {
			int value;
			while (isSpaceChar(value = peek()) && value != -1) {
				read();
			}
			return value == -1;
		}

		public String next() {
			return nextString();
		}

		public SpaceCharFilter getFilter() {
			return filter;
		}

		public void setFilter(SpaceCharFilter filter) {
			this.filter = filter;
		}

		public int[] nextIntArray(int n) {
			int[] array = new int[n];
			for (int i = 0; i < n; ++i)
				array[i] = nextInt();
			return array;
		}

		public int[] nextSortedIntArray(int n) {
			int array[] = nextIntArray(n);
			Arrays.sort(array);
			return array;
		}

		public int[] nextSumIntArray(int n) {
			int[] array = new int[n];
			array[0] = nextInt();
			for (int i = 1; i < n; ++i)
				array[i] = array[i - 1] + nextInt();
			return array;
		}

		public long[] nextLongArray(int n) {
			long[] array = new long[n];
			for (int i = 0; i < n; ++i)
				array[i] = nextLong();
			return array;
		}

		public long[] nextSumLongArray(int n) {
			long[] array = new long[n];
			array[0] = nextInt();
			for (int i = 1; i < n; ++i)
				array[i] = array[i - 1] + nextInt();
			return array;
		}

		public long[] nextSortedLongArray(int n) {
			long array[] = nextLongArray(n);
			Arrays.sort(array);
			return array;
		}

		public interface SpaceCharFilter {
			public boolean isSpaceChar(int ch);
		}
	}

	static class OutputWriter {
		private final PrintWriter writer;

		public OutputWriter(OutputStream outputStream) {
			writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outputStream)));
		}

		public OutputWriter(Writer writer) {
			this.writer = new PrintWriter(writer);
		}

		public void print(char[] array) {
			writer.print(array);
		}

		public void print(Object... objects) {
			for (int i = 0; i < objects.length; i++) {
				if (i != 0) {
					writer.print(' ');
				}
				writer.print(objects[i]);
			}
		}

		public void print(int[] array) {
			for (int i = 0; i < array.length; i++) {
				if (i != 0) {
					writer.print(' ');
				}
				writer.print(array[i]);
			}
		}

		public void print(double[] array) {
			for (int i = 0; i < array.length; i++) {
				if (i != 0) {
					writer.print(' ');
				}
				writer.print(array[i]);
			}
		}

		public void print(long[] array) {
			for (int i = 0; i < array.length; i++) {
				if (i != 0) {
					writer.print(' ');
				}
				writer.print(array[i]);
			}
		}

		public void println(int[] array) {
			print(array);
			writer.println();
		}

		public void println(double[] array) {
			print(array);
			writer.println();
		}

		public void println(long[] array) {
			print(array);
			writer.println();
		}

		public void println() {
			writer.println();
		}

		public void println(Object... objects) {
			print(objects);
			writer.println();
		}

		public void print(char i) {
			writer.print(i);
		}

		public void println(char i) {
			writer.println(i);
		}

		public void println(char[] array) {
			writer.println(array);
		}

		public void printf(String format, Object... objects) {
			writer.printf(format, objects);
		}

		public void close() {
			writer.close();
		}

		public void flush() {
			writer.flush();
		}

		public void print(long i) {
			writer.print(i);
		}

		public void println(long i) {
			writer.println(i);
		}

		public void print(int i) {
			writer.print(i);
		}

		public void println(int i) {
			writer.println(i);
		}

		public void separateLines(int[] array) {
			for (int i : array) {
				println(i);
			}
		}
	}
}

Measured memory_bytes: 47748