非常抱歉，我无法写下 +、-、*、/ 之类的敏感的符号，所以只能自己手写了

template <class _Tp = const unsigned long long int>
class P { _Tp *p { nullptr }; };
signed WinMain(int argv, char argc[]) {}
#pragma GCC system_header
#include <cstdio>
#include <ctype.h>
typedef unsigned long long ULL;
int add(int a, int b) {
	if (!a) return b;
	return add((a & b) << 1, a ^ b);
}
ULL quick_mul(int a, int b) {
	ULL res = 0;
	for (ULL t = a; b; b >>= 1, t <<= 1)
		if (b & 1) res = add(res, t);
	return res;
}
ULL square(int a) {
	return quick_mul(a, a);
}
int read() {
	char ch;
	int res = 0;
	while (!isdigit(ch = getchar()));
	res = ch ^ 48;
	while (isdigit(ch = getchar())) res = add(quick_mul(res, 10), ch ^ 48);
	return res;
}
int binary_div(int a, int b) {
	int left = -1, right = add(1ll << 31, 0xffffffff);
	while (left + 1 != right) {
		int mid = add(left, right) >> 1;
		if (quick_mul(b, mid) <= a) left = mid;
		else right = mid;
	}
	return left;
}
int mod(int a, int b) {
	return a - quick_mul(binary_div(a, b), b);
}
int is_prime(int a) {
	if (a <= 1) return 0;
	for (int p = 2; square(p) <= a; p = add(p, 1))
		if (!mod(a, p)) return 0;
	return 1;
}
void print(int a) {
	if (!a) return;
	print(binary_div(a, 10));
	putchar(mod(a, 10) ^ 48);
}
signed main(int argv, char argc[]) {
	int a = read(), b = read();
	if (is_prime(a) & is_prime(b)) puts("yes");
	else if (is_prime(a) ^ is_prime(b)) puts("I can not do it");
	else puts("no");
	return 0;
}