/*
 /+==================================================+\
//+--------------------------------------------------+\\
|.|\\...>>>>>>> Hollwo_Pelw(ass) 's code <<<<<<<...//|.|
\\+--------------------------------------------------+//
 \+==================================================+/
*/
#include <bits/stdc++.h>
using namespace std;
// type
typedef long long ll;
typedef long double ld;
// loop
//#define For(i, l, r)        for (int i = l; i < r; i++)
//#define ForE(i, l, r)       for (int i = l; i <= r; i++)
//#define Ford(i, r, l)       for (int i = r; i > l; i--)
//#define FordE(i, r, l)      for (int i = r; i >= l; i--)
//#define Fora(i, a)          for (auto i : a)
// I/O
#define open(file, in, out) if (fopen(file in, "r")) {        \
                                freopen(file in, "r", stdin);  \
                                freopen(file out, "w", stdout); \
                            }
#define FAST_IO             std::ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define setpre(n)           fixed << setprecision(n)
// pair
#define F                   first
#define S                   second
#define pii                 pair<int, int>
#define pll                 pair<ll, ll>
#define pdd                 pair<ld, ld>
// vector & !!?(string)
#define eb                  emplace_back
#define pb                  push_back
#define all(a)              a.begin(), a.end()
#define rall(a)             a.rbegin(), a.rend()
#define sz(a)               a.size()
#define len(a)              a.length()
// geometry calculate
#define pi                  acos(-1.0)
#define g_sin(a)            sin(a*pi/180)
#define g_cos(a)            cos(a*pi/180)
#define g_tan(a)            tan(a*pi/180)
// set val
#define ms0(a)              memset(a,        0, sizeof(a));
#define ms1(a)              memset(a,        1, sizeof(a));
#define msn1(a)             memset(a,       -1, sizeof(a));
#define msinf(a)            memset(a, 0x3f3f3f, sizeof(a));
// constant
const int mod1 = 998244353, mod = 1e9+7;
const int MAXN = 100005, MAXM = 200010;
// code
#define int long long
int dp[3003][3003], n, m, cnt[3003], rmx[3003];
string s;
void Solve() {
    cin >> n >> m >> s;
    for (int i = 1; i <= n; i++){
        cnt[i] = cnt[i-1] + s[i-1] - '0';
        rmx[i] = i;
    }
    for (int i = 0, l, r; i < m; i++){
        cin >> l >> r;
        rmx[l] = max(rmx[l], r);
    }
    dp[0][0] = 1;
    for (int i = 1; i <= n; i++){
        rmx[i] = max({rmx[i], rmx[i-1], i});
        if (cnt[rmx[i]] < rmx[i] - i + 1)
            dp[i][0] = dp[i-1][0];
        for (int j = 1; j <= i; j++){
            if (cnt[rmx[i]] - j < rmx[i] - i + 1)
                dp[i][j] = dp[i-1][j];
            if (cnt[rmx[i]] - j >= 0)
                (dp[i][j] += dp[i-1][j-1]) %= mod;
        }
    }
    int ans = 0;
    for (int i = 0; i <= n; i++){
        (ans += dp[n][i]) %= mod;
    }
    cout << ans;
}

signed main(){
    open("", ".inp", ".out");
    FAST_IO; int TC = 1;
    //cin >> TC;
    while(TC--) Solve();
    return 0;
}
/*

./-=====>>><<<-------- DEBUG -------->>><<<=====-\.
/.................................................\

+====================== INP ======================+


+====================== OUT ======================+


\................................................./
.\-=====>>><<<--------= END =-------->>><<<=====-/.

*/


Measured memory_bytes: 49780