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#include "math/gcd.hpp"
long long gcd(long long a, long long b) {
if(b == 0) return a;
return gcd(b, a % b);
}
#line 1 "math/gcd.hpp"
long long gcd(long long a, long long b) {
if(b == 0) return a;
return gcd(b, a % b);
}