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#include <stdbool.h> #include <stdio.h> bool isPrime(int n) { if (n == 1 || n == 0) return false; for (int i = 2; i <= n / 2; i++) { if (n % i == 0) return false; } return true; } int main() { int N = 500000; long total = 0; for (int i = 1; i <= N; i++) { if (isPrime(i)) { total += i; } } printf("total: %ld", total); return 0; }
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