diff --git a/src/algebra/binary-exp.md b/src/algebra/binary-exp.md
index 52dfd27a5..7a9938fe9 100644
--- a/src/algebra/binary-exp.md
+++ b/src/algebra/binary-exp.md
@@ -104,8 +104,8 @@ long long binpow(long long a, long long b, long long m) {
long long res = 1;
while (b > 0) {
if (b & 1)
- res = res * a % m;
- a = a * a % m;
+ res = (res%m * a%m) % m;
+ a = (a%m * a%m) % m;
b >>= 1;
}
return res;
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