diff --git a/src/prover_slow.h b/src/prover_slow.h
index 3c88165..9e735d2 100644
--- a/src/prover_slow.h
+++ b/src/prover_slow.h
@@ -26,6 +26,7 @@ uint64_t GetBlock(uint64_t i, uint64_t k, uint64_t T, integer& B) {
     mpz_mul_2exp(res.impl, res.impl, k);
     res = res / B;
     auto res_vector = res.to_vector();
+    printf("GB %lld\n",res_vector.empty() ? 0 : res_vector[0]);
     return res_vector.empty() ? 0 : res_vector[0];
 }