#pragma GCC optimize ("O3")
#pragma GCC target ("avx")
#include "bits/stdc++.h" // define macro "/D__MAI"

using namespace std;
typedef long long int ll;

#define xprintf(fmt,...) fprintf(stderr,fmt,__VA_ARGS__)
#define debugv(v) {printf("L%d %s > ",__LINE__,#v);for(auto e:v){cout<<e<<" ";}cout<<endl;}
#define debuga(m,w) {printf("L%d %s > ",__LINE__,#m);for(int x=0;x<(w);x++){cout<<(m)[x]<<" ";}cout<<endl;}
#define debugaa(m,h,w) {printf("L%d %s >\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[y][x]<<" ";}cout<<endl;}}
#define ALL(v) (v).begin(),(v).end()
#define repeat(cnt,l) for(auto cnt=0ll;cnt<(l);++cnt)
#define iterate(cnt,b,e) for(auto cnt=(b);cnt!=(e);++cnt)
#define MD 1000000007ll
#define PI 3.1415926535897932384626433832795
template<typename T1, typename T2> ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << "(" << p.first << ":" << p.second << ")"; return o; }
template<typename iterator> inline size_t argmin(iterator begin, iterator end) { return distance(begin, min_element(begin, end)); }
template<typename iterator> inline size_t argmax(iterator begin, iterator end) { return distance(begin, max_element(begin, end)); }
template<typename T> T& maxset(T& to, const T& val) { return to = max(to, val); }
template<typename T> T& minset(T& to, const T& val) { return to = min(to, val); }

mt19937_64 randdev(8901016);
inline ll rand_range(ll l, ll h) {
    return uniform_int_distribution<ll>(l, h)(randdev);
}

#ifdef __MAI
#define getchar_unlocked getchar
#define putchar_unlocked putchar
#endif
#ifdef __VSCC
#define getchar_unlocked _getchar_nolock
#define putchar_unlocked _putchar_nolock
#endif
namespace {
#define isvisiblechar(c) (0x21<=(c)&&(c)<=0x7E)
    class MaiScanner {
    public:
        template<typename T> void input_integer(T& var) {
            var = 0;
            T sign = 1;
            int cc = getchar_unlocked();
            for (; cc<'0' || '9'<cc; cc = getchar_unlocked())
                if (cc == '-') sign = -1;
            for (; '0' <= cc&&cc <= '9'; cc = getchar_unlocked())
                var = (var << 3) + (var << 1) + cc - '0';
            var = var*sign;
        }
        inline int c() { return getchar_unlocked(); }
        inline MaiScanner& operator>>(int& var) {
            input_integer<int>(var);
            return *this;
        }
        inline MaiScanner& operator>>(long long& var) {
            input_integer<long long>(var);
            return *this;
        }
        inline MaiScanner& operator>>(string& var) {
            int cc = getchar_unlocked();
            for (; !isvisiblechar(cc); cc = getchar_unlocked());
            for (; isvisiblechar(cc); cc = getchar_unlocked())
                var.push_back(cc);
            return *this;
        }
        template<typename IT> void in(IT begin, IT end) {
            for (auto it = begin; it != end; ++it) *this >> *it;
        }
    };
    class MaiPrinter {
        int stack_p;
        char stack[32];
    public:
        template<typename T>
        void output_integer(T var) {
            if (var == 0) {
                putchar_unlocked('0');
                return;
            }
            if (var < 0) {
                putchar_unlocked('-');
                var = -var;
            }
            stack_p = 0;
            while (var) {
                stack[stack_p++] = '0' + (var % 10);
                var /= 10;
            }
            while (stack_p)
                putchar_unlocked(stack[--stack_p]);
        }
        MaiPrinter& operator<<(char c) {
            putchar_unlocked(c);
            return *this;
        }
        MaiPrinter& operator<<(int var) {
            output_integer<int>(var);
            return *this;
        }
        MaiPrinter& operator<<(long long var) {
            output_integer<long long>(var);
            return *this;
        }
        MaiPrinter& operator<(int var) {
            output_integer<int>(var);
            putchar_unlocked(' ');
            return *this;
        }
        MaiPrinter& operator<(long long var) {
            output_integer<long long>(var);
            putchar_unlocked(' ');
            return *this;
        }
        MaiPrinter& operator<<(const string& str) {
            const char* p = str.c_str();
            const char* l = p + str.size();
            while (p < l) putchar_unlocked(*p++);
            return *this;
        }
    };
}
MaiScanner scanner;
MaiPrinter printer;





template<typename T>
class segtree {
    int size;
    vector<T> valtree;
    vector<int> ismixedtree;

public:
    segtree(int n) {
        size = 8;
        while (size < n) size <<= 1;
        valtree.resize(size*2);
        ismixedtree.resize(size*2);
    }
    
    void fill(T val){
        std::fill(ALL(valtree), val);
        std::fill(ALL(ismixedtree), 0);
    }

    
    void setvalrange(int begin, int end, T val, int ptr = 0, int rangebegin = 0, int rangeend = 0) {
        if (rangeend <= rangebegin) { rangeend = size; }

        if (rangeend <= begin || end <= rangebegin) return;
        
        if (begin <= rangebegin && rangeend <= end) {
            ismixedtree[ptr] = false;
            valtree[ptr] = val;
            return;
        }
        
        int rangemid = (rangebegin + rangeend) / 2;
        if (ismixedtree[ptr] == false){
            // lazy
            valtree[ptr * 2 + 1] = valtree[ptr];
            valtree[ptr * 2 + 2] = valtree[ptr];
            ismixedtree[ptr * 2 + 1] = false;
            ismixedtree[ptr * 2 + 2] = false;
        }
        ismixedtree[ptr] = true;

        setvalrange(begin, end, val, ptr * 2 + 1, rangebegin, rangemid);
        setvalrange(begin, end, val, ptr * 2 + 2, rangemid, rangeend);

    }

    T getval(int index, int ptr = 0, int rangebegin = 0, int rangeend = 0) {
        if (rangeend <= rangebegin) { rangeend = size; }

        if (ismixedtree[ptr] == false) {
            return valtree[ptr];
        }


        int rangemid = (rangebegin + rangeend) / 2;
        if (index < rangemid)
            return getval(index, ptr * 2 + 1, rangebegin, rangemid);
        else
            return getval(index, ptr * 2 + 2, rangemid, rangeend);

    }
};


ll m, n, kei;


int main() {
    int q;
    scanner >> n >> q;

    segtree<int> seg(n);
    seg.fill(0x7FFFFFFF);

    repeat(_, q) {
        int t;
        scanner >> t;
        if (t == 0) {
            int s, t, x;
            scanner >> s >> t >> x;
            //--s; --t;
            seg.setvalrange(s, t + 1, x);
        }
        else {
            int s, t;
            scanner >> s;
            //--s; --t;
            printer << (seg.getval(s)) << '\n';
        }
    }

    return 0;
}

Measured memory_bytes: 4892